ACCOUNTING TECHNICIANS
SCHEME
(WEST AFRICA)

PRINCIPLES OF AUDITING

PRINCIPLES OF AUDITING

i


ACCOUNTING TECHNICIANS SCHEME OFWEST AFRICA(ATSWA)

ACCOUNTING TECHNICIANS SCHEME
(WEST AFRICA)

STUDY PACK FOR

PRINCIPLES OF AUDITING

SECOND EDITION
Copyright (c) 2009 by Association of Accountancy Bodies in West Africa
(ABWA). All rights reserved. No part of this publication may be reproduced or
distributed in any form or by any means, or stored in a database or retrieval system,
without the prior written consent of the copyright owner. Including, but not limited
to, in any network or other electronic storage or transmission, or broadcast for
distance learning.
Published by
ABWA PUBLISHERS
DISCLAIMER
This book is published by ABWA; however, the views are entirely those of the

writers.

PRINCIPLES OF AUDITING

ii


PREFACE

INTRODUCTION
The Council of the Association of Accountancy Bodies in West Africa (ABWA) has
recognised the difficulty of students when preparing for the Accounting Technicians
Scheme West Africa examinations. One of the major difficulties has been the nonavailability of study materials purposely written for the Scheme. Consequently, students
relied on text books written in economic and socio-cultural environments quite
different from the West African environment.
AIM OF THE STUDY PACK
In view of the above, the quest for good study materials for the subjects of the
Accounting Technicians Scheme examinations and the commitment of the ABWA
Council to bridge the gap in technical accounting training in West Africa has led to the
production of this Study Pack.
The Study Pack assumes a minimum prior knowledge and every chapter reappraises basic
methods and ideas in line with the syllabus.

READERSHIP
The Study Pack is primarily intended to provide comprehensive study materials for
studentspreparing to write the ATSWA examinations.
Other beneficiaries of the Study Pack include candidates of other Professional
Institutes, students of Universities and Polytechnics pursuing first degree and post
graduate studies in Accounting, advanced degrees in Accounting as well as Professional
Accountantswho may use the Study Pack as a reference material.


APPROACH
The Study Pack has been designed for independent study by students and as such
concepts have been developed methodically or as a text to be used in conjunction
with tuition at schools and colleges. The Study Pack can be effectively used as a
course text and for revision. It is recommended that readers have their own copies.
PRINCIPLES OF AUDITING

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FOREWORD
The ABWA Council, in order to actualize its desire and ensure the success of students at
the examinations of the Accounting Technicians Scheme West Africa (ATSWA), put in
place by Harmonisation Committee, to among other things, facilitate the production of
Study Packs for students. Hitherto, the major obstacle faced by students was the dearth of
study texts which they needed to prepare for the examinations.
The Committee took up the challenge and commenced the task in earnest. To start off the
process, the existing syllabus in use by some member Institutes were harmonized and
reviewed. Renowned professionals in private and public sectors, the academia, as well as
eminent scholars who had previously written books on the relevant subjects and
distinguished themselves in the profession, were commissioned to produce Study Packs for
the twelve subjects of the examination.
A minimum of two Writers and a Reviewer were tasked with the preparation of a Study
Pack for each subject. Their output was subjected to a comprehensive review by
experienced imprimaturs. The Packs cover the following subjects:

PART I
1. Basic Accounting Processes and Systems
2. Economics

3. Business Law
4. Communication Skills
PART II
1. Principles and Practice of Financial Accounting
2. Public Sector Accounting
3. Quantitative Analysis
4. Information Technology
PART III
1. Principles of Auditing
2. Cost Accounting
3. Preparing Tax Computation and Returns
4. Management
PRINCIPLES OF AUDITING

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Although, these Study Packs have been specially designed to assist candidates preparing
for the technicians examinations of ABWA, they should be used in conjunction with other
materials listed in the bibliography and recommended text.

PRESIDENT, ABWA

PRINCIPLES OF AUDITING

v


ACKNOWLEDGEMENTS


The ATSWA Harmonisation Committee, on the occasion of the publication of the second
edition of the ATSWA Study Packs acknowledges the contributions of the following groups of
people. The ABWA Council, for their inspiration which gave birth to the whole idea of having a
West African Technicians programme. Their support and encouragement as well as financial
support cannot be overemphasized. We are eternally grateful.
To The Councils of Institute of Chartered Accountants of Nigeria (ICAN), and Institute of
Chartered Accountants, Ghana (ICAG), for their financial commitment and the release of staff
at various points to work on the programme and for hosting the several meetings of the
Committee, we say kudos.

The contributions of various writers, reviewers, imprimaturs and workshop facilitators, who
spent precious hours writing and reviewing the Study Packs, cannot be overlooked. Without
their input, we would not have had these Study Packs. We salute them.

Lastly, but not the least, to the members of the Committee, we say well done.

ATSWA Harmonisation Committee

PRINCIPLES OF AUDITING

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STRUCTURE OF THE STUDY PACK
The layout of the chapters has been standardized so as to present information in a simpleform
that is easy to assimilate.

The Study Pack is organised into chapters. Each chapter deals with a particular area of the
subject, starting with learning objective and a summary of sections contained therein.


The introduction also gives specific guidance to the reader based on the contents of current
syllabus and the current trends in examinations. The main body of the chapter is subdivided
into sections to make for easy and coherent reading. However, insome chapters, the emphasis is on
the principles or applications while others emphasize methods and procedures.
At the end of each chapter is found the following:
•

Summary;

• Multiple Choice Questions, Short Answer Questions and their suggested solutions;

HOW TO USE THE STUDY PACK
Students are advised to read the Study Pack, attempt the questions before checking the
suggested answers.

PRINCIPLES OF AUDITING

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TABLE OF CONTENTS
TITLE PAGE......................................................................................................................................i
COPYRIGHTAND DISCLAIMERS................................................................................................ii
PREFACE.........................................................................................................................................iii
FORWARD......................................................................................................................................iv
ACKNOWLEDGEMENT................................................................................................................vi
STRUCTURE OF THE STUDY PACK.........................................................................................vii
TABLE OF CONTENTS...............................................................................................................viii
SYLLABUS AND EXAMINATION QUESTIONS OUTLINE.................................................................xix


CHAPTER ONE
1.0
THE NATURE, PURPOSE AND SCOPE OF AUDITING...........................
1
1.1
Introduction…………………………………………………………………. ..... 1
1.2
Historical Background……………………………………………………….. .... 2
1.3
Auditing Today………………………………………………………………...... 2
1.4
Definition of Audit……………………………………………………………..... 3
1.5
Why the Need for an Audit……………………………………………………..... 4
1.6
Objective and General Principles Governing the Audit of Financial Statements… 5
1.6.1 Objective of an Audit…………………………………………………………....... 5
1.6.2 General Principles of an Audit………………………………………………......... 6
1.6.3 Scope of an Audit……………………………………………………………..........7
1.6.4 Reasonable Assurance………………………………………………………..... .... 7
1.6.5 Audit Risk and Materiality……………………………………………….. .......... 8
1.6.6 Responsibility for the Financial Statements………………………………….......... 9
1.6.7 Public Sector Perspective……………………………………………………. ......... 9
1.7
Advantages of Audit…………………………………………………………......... 9
1.8
Disadvantages of Audit…………………………………………………................ 10
1.9
Limitations of Audit……………………………………………………....... .......... 11
1.10 The Expectation Gap………………………………………………………............ 11

1.11 The Structure of an Audit Firm………………………………………………........ 12
1.12 Types of Audits………………………………………………………………....... 13
1.12.1 Private Audit and Statutory Audit…………………………………………............ 13
1.12.2 External and Internal Audit…………………………………………………......... 13
1.12.3 Complete Audit, Interim Audit and Continuous Audit……………………........... 14
1.13 The Chronology of Audit…………………………………………………........... 15
1.13.1 Auditing and Other Services.................................................................................... 17
1.13.2 The Agency Theory and Auditing…………………………………………........... 18
1.13.3 Audit Committees……………………………………………………………....... 20
1.14 Chapter Summary......................................................................................................21
CHAPTER TWO
THE REGULATORY FRAMEWORK OF AUDITING
2.0
Auditorsand the Company Law………………………………………………
2.1
Keeping Proper Books of Accounts....................................................................
2.2
Mandatory Requirements to have Accounts Audited…………………………
2.3
Appointment and Remuneration of Auditors………….......………………....
2.3.1 Who Qualifies to be an Auditor.......................................……………………
2.3.2 Who Appoints Auditors...........................................................………………

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2.3.3
2.4
2.4.1
2.4.2
2.4.3
2.4.4
2.4.5
2.5
2.5.1
2.5.2
2.6
2.6.1
2.6.2
2.6.3
2.7
2.7.1
2.7.2
2.7.3
2.7.4
2.7.5
2.7.6
2.7.7
2.7.8
2.7.9

2.7.10
2.7.11
2.7.12
2.7.13
2.8
2.8.1
2.8.2
2.8.3
2.8.4
2.8.5
2.8.6
2.8.7
2.8.8
2.8.9
2.8.10
2.8.11
2.8.12
2.8.13
2.8.14
2.8.15
2.9
2.9.1
2.9.2
2.9.3
2.10
2.10.1

Who fixes the Auditors‟ Remuneration……………………………………...
Removal and Resignation of an Auditor......………………………………...
Resignation of an Auditor………………………………………….. ……….

Virtually, the Same Provisions in Ghana Companies Code............................
Removal of an Auditor.....................................................................................
Similar Provisions in Ghana Companies Code................................................
Other Types of Departure from Office.............................................................
Rights and Responsibilities of an Auditor........................................................
Duties of the Auditor........................................................................................
The Rights of an Auditor..................................................................................
Professional Requirements as to Competence and Integrity.............................
The Principles of Due Skill Care and Competence...........................................
The Principles of Integrity.................................................................................
Professional Duty of Confidence......................................................................
Professional Requirements as to Objectivity and Independence......................
Objectivity and Independence..........................................................................
Undue Dependence on an Audit Client............................................................
Overdue Fees...................................................................................................
Actual or Threatened Litigation.......................................................................
Associated Firms: Influences Outside the Practice.........................................
Family and Other Personal Relationships........................................................
Beneficial Interests in Shares and Other Investments......................................
Beneficial Interest in Trusts..............................................................................
Trustee Investments..........................................................................................
Voting on Audit Appointments........................................................................
Loans.................................................................................................................
Goods and Services: Hospitality.....................................................................
Integrity, Objectivity and Independence – Review of Procedures..................
Procedure of Audit Appointment....................................................................
Introduction.....................................................................................................
Pre-Accepting Conditions..............................................................................
Ethical Consideration.....................................................................................
Legal Consideration.......................................................................................

Practical Consideration..................................................................................
Seeking Reference About the Client..............................................................
Sources of Information About New Clients...................................................
Communicating with the Present Auditors....................................................
Post-Acceptance Procedures..........................................................................
Letter of Engagement.....................................................................................
Purposes of Letter of Engagement..................................................................
Contents of Letter of Engagement...................................................................
Issuing and Revising Engagement Letters.......................................................
Public Sector Perspective..................................................................................
Example of Letter of Engagement....................................................................
Auditors Liability and Legal Responsibility.....................................................
Introduction......................................................................................................
Liability Under Statute.....................................................................................
Liability Under Contract Law..........................................................................
Auditors‟ responsibility to Consider Fraud and Error......................................
Introduction......................................................................................................

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2.10.2 Responsibility of the Directors..........................................................................
52
2.11 Responsibility of the Auditors..........................................................................
52
2.11.1 Prevention.........................................................................................................
52
2.11.2 Risk Assessment...............................................................................................
52
2.11.3 Detection..........................................................................................................
53
2.11.4 Procedures When There is an Indication that Fraud or Error May Exist.........
54
2.11.5 Reporting Fraud and Error to Management......................................................
55
2.11.6 Reporting Fraud and Error to Members of the Company.................................
55

2.11.7 Reporting Fraud and Error to Third Parties......................................................
56
2.11.8 Withdrawal from the Engagement....................................................................
58
2.12 Auditors‟ Responsibility to Consider Non-Compliance with Loans and Regulations59
2.12.1 Introduction......................................................................................................
59
2.12.2 Responsibilities of the Directors.......................................................................
59
2.12.3 Responsibilities of the Auditors.......................................................................
61
2.12.4 Auditors in the Public Sector.........................................................................
62
2.12.5 The Auditors‟ Consideration of Compliance with Laws and regulations...........
62
2.12.6 Procedure when Possible Non-Compliance with Law or Regulation is Discovered 64
2.12.7 Reporting Non-Compliance with Laws or Regulations to Management.............. 66
2.12.8 Reporting Non-Compliance with Laws or Regulations to Members of the Company67
2.12.9 Reporting Non-Compliance with Laws or Regulations to Third Parties...............
68
2.12.10Withdrawal from Engagement................................................................................... 70
2.13 Impact of Laws and Accounting Standards or Audit............................................. 71
2.13.1 The Statutory Audit carried out in Nigeria............................................................. 71
2.13.2 The Financial Reporting Council (FRC)................................................................ 71
2.13.3 Statements of Accounting Standards (SAS).......................................................... 72
2.13.4 Main Functions of Financial Reporting Council................................................... 72
2.14 Banks and Other Financial Institutions Act 1991 (BOFIA)................................. 74
2.14.1 Publication of Annual Accounts of Banks...........................................................
75
2.14.2 Contents and Form of Accounts..........................................................................

75
2.14.3 Appointment, Power and Report of Approved Auditor.....................................
76
2.15 Insurance Act 2003.............................................................................................
78
2.15.1 Section 10............................................................................................................
79
2.15.2 Sections 17 and 18...............................................................................................
79
2.15.3 The Records to be kept and maintained by an Insurer at its Principal Office.....
80
2.15.4 Sections 20-23......................................................................................................
81
2.15.5 Section 25.............................................................................................................
81
2.15.6 Section 26.............................................................................................................
81
2.15.7 General Insurance Business.................................................................................. 81
2.15.8 Life Assurance Business....................................................................................... 82
2.15.9 Composite Business (Life and General)............................................................... 82
2.16 Chapter Summary................................................................................................. 82
CHAPTER THREE......................................................................................................
3.0
PROFESSIONAL ETHICS
3.1
Fundamental Principles of Code of Ethics and Conduct………………………
3.2
Professional Conduct for the members of The Institute of Chartered
Accountants of Nigeria .....................................................................................
3.3

Requirements and Applications of Professional Ethics in the conduct of
Auditors‟ independence, objectivity, and integrity as set out in ICAN‟s code
ofEthics and conduct…………………………………………………………

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3.4
3.5

Auditors‟ responsibilities with regard to confidentiality as set out in ICAN‟s
Code of Ethics and Conduct…………………………………………………
Chapter Summary.............................................................................................

89
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CHAPTER FOUR......................................................................................................
4.0
AUDITORS’ LIABILITY
4.1
Introduction.......................... ...........................................................................

4.2
Auditors‟ Liability for Negligence under Common Law................................
4.3
Statutory Liability...........................................................................................
4.4
Criminal Liability under CAMA....................................................................
4.5
Criminal Liability under Section 436 of Nigeria Criminal Code..................
4.6
Chapter Summary............................................................................................

95

CHAPTER FIVE........................................................................................................
5.0
AUDIT PLANNING AND DOCUMENTATION
5.1
Audit Planning Procedures…………………………………………………....
5.2
Planning an Audit of Financial Statements …………………………………
5.3
Preliminary Engagement Activities…………………………………………..
5.4
The Overall Audit Strategy...............................................……………………
5.5
The Audit Plan...........................................................……………………….
5.6
Changes to Planning Decisions during the course of the Audit......................
5.7
Direction, Supervision and Review.................................................................

5.8
Procedures.......................................................................................................
5.9
Audit Planning Memorandum........................................................................
5.10 Knowledge of the Clients‟ Business...............................................................
5.10.1 Introduction....................................................................................................
5.10.2 Sources of Knowledge....................................................................................
5.10.3 Using the Knowledge......................................................................................
5.10.4 Matters to consider in relation to Knowledge of the Clients‟ Business...........
5.10.5 The Industrial Conditions Affecting the Clients‟ Business.............................
5.10.6 The Entity‟s Business.......................................................................................
5.10.7 Financial Performance.......................................................................................
5.10.8 Reporting Environment.......................................................................................
5.11 Audit Risks Assessment and Planning for Materiality.......................................
5.11.1 Introduction........................................................................................................
5.11.2 Risk-based Audit................................................................................................
5.11.3 Total Audit Risk..................................................................................................
5.11.4 Interest Risk..........................................................................................................
5.11.5 Control Risk.........................................................................................................
5.11.6 Detection Risk.....................................................................................................
5.12 Planning for Materiality....................................................................................
5.12.1 Introduction.....................................................................................................
5.12.2 Materiality........................................................................................................
5.12.3 The Relationship between Materiality and Audit Risk....................................
5.12.4 Materiality and Audit Risk in Evaluating Audit Evidence..............................
5.12.5 Evaluating the Effect of Miss-statements........................................................
5.12.6 Communication of Errors................................................................................
5.12.7 Public Sector Perspective..................................................................................
5.13 Audit Documentation: Audit Files and Working Papers..................................
5.13.1 Introduction.......................................................................................................


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5.13.2
5.13.3
5.13.4
5.13.5
5.13.6
5.13.7
5.14

Audit Working Papers........................................................................................

Form and Contents of Working Papers..............................................................
Audit Files..........................................................................................................
Permanent Files...................................................................................................
Current Files.......................................................................................................
Confidentiality Custody and Ownership of Working Papers............................
Chapter Summary..............................................................................................

CHAPTER SIX
AUDIT EVIDENCE AND VERIFICATION PROCEDURES..........................
6.0
Nature and Scope of Audit Evidence………………………………………
6.1
Introduction.......................…………………………………………………
6.2
The Concept of Audit Evidence..........................................………………..
6.3
Types of Audit Evidence……………………………………………….......
6.3.1 Accounting Records.....……………………………………………….........
6.3.2 Financial Statements Prepared by Management…………………………....
6.3.3 Other Audit Evidence……………………………………………………..
6.3.4 Sufficient Appropriate Audit Evidence……………………………………
6.3.5 Obtaining Audit Evidence............................................................................
6.4
Inspection of Records or Documents............................................................
6.4.1 Inspection of Tangible Assets........................................................................
6.4.2 Observation....................................................................................................
6.4.3 Inquiry............................................................................................................
6.4.4 Confirmation...................................................................................................
6.4.5 Re-Calculation................................................................................................
6.4.6 Re-performance...............................................................................................

6.4.7 Analytical Procedures......................................................................................
6.5
Third Party Confirmations...............................................................................
6.5.1 Introduction....................................................................................................
6.5.2 Meaning of External Confirmations...............................................................
6.5.3 Designing the External Confirmation Request..............................................
6.5.4 Use of Positive and Negative Confirmation...................................................
6.5.5 Management Requests...................................................................................
6.5.6 Characteristics of Respondents.....................................................................
6.5.7 The External Confirmation Process...............................................................
6.5.8 No response to a positive Confirmation Request...........................................
6.5.9 Reliability of Responses Received................................................................
6.5.10 Causes and Frequency of Exceptions............................................................
6.5.11 Evaluating the Results of the Confirmation Process.....................................
6.5.12 External Confirmations Prior to the Year-End..............................................
6.6
End Specific Examples of Third Party Confirmations..................................
6.6.1 Debtors Circularization.................................................................................
6.6.2 Recording and Evaluation of Circularization Results...................................
6.6.3 Bank Confirmation........................................................................................
6.6.4 Matters Excluded from the Standard Bank Letter........................................
6.6.5 Legal Confirmation – Pending Legal Matters................................................
6.6.6 Specimen of Lawyer‟s Confirmation..............................................................
6.6.7 Summary of Third Party Confirmation..........................................................
6.7
Factors that Influence the reliability of Audit Evidence.................................
6.8
Using the Work of an Expert.......................................................................

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6.8.1 Introduction..................................................................................................
165
6.8.2 Determining the Need to use the Work of an Expert....................................
166
6.8.3 Competence and Objectivity of the Expert.....................................................
166

6.8.4 Scope of the Work of an Expert......................................................................
167
6.8.5 Evaluating the Work of an Expert...................................................................
168
6.8.6 Reference to an Expert in the Auditor‟s Report..............................................
169
6.9
Management Representation............................................................................
169
6.9.1 Introduction......................................................................................................
169
6.9.2 Acknowledgement by Management of its Responsibility for the Financial Statements 169
6.9.3 Representations by Management as Audit Evidence........................................
169
6.9.4 Documentation of Representations by Management.........................................
171
6.9.5 Basic Elements of a Management representation Letter...................................
171
6.9.6 Example of a Management Representations Letter...........................................
172
6.9.7 Action if Management Refuses to Provide Representations.............................
175
6.10 Verification of Assets and liabilities..................................................................
175
6.10.1 Introduction.......................................................................................................
175
6.10.2 Verification of Assets.........................................................................................
175
6.10.3 Verification of Trade Debtors and Creditors......................................................
176

6.10.4 Circularization of Debtors...................................................................................
176
6.10.5 Verification of Stock and Work-Progress............................................................
177
6.10.6 Objectives of Stock Taking.................................................................................
178
6.10.7 Liability Verification..........................................................................................
178
6.10.8 Verification Procedures......................................................................................
179
6.10.9 Verification of Non-current Assets....................................................................
180
6.10.10 Audit of Intangible Asset..................................................................................
180
6.11 Quality Control..................................................................................................
181
6.12 Audit Risk Areas that Demand Special Attention.............................................
182
6.13 Features of Audit Quality Control......................................................................
182
6.14 Peer Review........................................................................................................
184
6.15 Physical Examination..........................................................................................
184
6.16 Chapter Summary................................................................................................
185

CHAPTER SEVEN
INTERNAL CONTROL SYSTEM.........................................................................
7.1

Introduction…………………………………………………………….........
7.2
Definition of Internal Control………………………………………………
7.2.1 Objectives of Internal Control......……………………………………………
7.2.2 The Essential Features of Internal Control……………………………………
7.2.3 Types of Internal Control............................ ....................................................
7.2.4 Importance of Internal Control to Auditors .....................................................
7.2.5 Scope and Components of Internal Control System…………………………
7.2.6 Internal Control and Other Inherent Limitations...........……………………..
7.2.7 Factors that will determine the Success of an Internal Control System…......
7.2.8 Understanding the Internal Control System by the Auditors………………..
7.2.9 Ascertaining the Internal Control System by the Auditors…………………….
7.2.10 Recording the Systems of Control..………………………………………….
7.2.11 Flow Charts..................................................…………………………………
7.2.12 Evaluating the Internal Control System.................……………….................
7.2.13 Practical Application of Internal Control…………………………………....

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7.2.14
7.2.15
7.2.16
7.3

Control Systems as They Apply to Small Entities..........................................
Reporting on Internal Control to Management...............................................
Internal Audit as a Control Factor..................................................................
Chapter Summary...........................................................................................

CHAPTER EIGHT
8.0
AUDIT TESTS AND SAMPLING PROCEDURES..................................
8.1
Audit Sampling..................................................................................................
8.1.1 Introduction.......................................................................................................
8.1.2 Definitions..........................................................................................................
8.1.3 Selecting Items for Testing to Gather Audit Evidence......................................
8.1.4 Selecting all Items.............................................................................................
8.1.5 Selecting Specific Items....................................................................................
8.1.6 Audit Sampling..................................................................................................

8.1.7 Judgement Sampling..........................................................................................
8.1.8 Design of the Sample.........................................................................................
8.1.9 Population..........................................................................................................
8.1.10 Value Weighted Selection....................................................................................
8.1.11 Sampling Size.......................................................................................................
8.1.12 Selecting the Sample.............................................................................................
8.1.13 Selection Methods.................................................................................................
8.1.14 Performing the Audit Procedure............................................................................
8.1.15 Nature and Cause of Errors....................................................................................
8.1.16 Projecting Errors....................................................................................................
8.1.17 Evaluating the Sample Results..............................................................................
8.1.18 Summary of Steps in Audit Sampling...................................................................
8.2
Substantive Procedures..........................................................................................
8.2.1 Nature of Substantive Procedures..........................................................................
8.2.2 Substantive Testing Procedures for Key Audit Areas...........................................
8.2.3 Purchase and Payments.........................................................................................
8.2.4 Payroll....................................................................................................................
8.3
Verification of Balance Sheet Items......................................................................
8.3.1 Introduction............................................................................................................
8.3.2 Specific Verification Objectives.............................................................................
8.3.3 Presentation/Disclosure..........................................................................................
8.3.4 Verification Procedures..........................................................................................
8.3.5 Verification Objectives and Programmes for some balance sheet items................
8.3.6 Audit Programme for Verification of Stock Quality..............................................
8.3.7 Audit Programmes for the Verification of Stock-Valuation..................................
8.3.8 Audit Programme for the Verification of Value of Work-Progress........................
8.3.9 Audit Programme for the Value of Stocks-General................................................
8.3.10 Attendance at Stocktaking......................................................................................

8.3.11 Responsibility.........................................................................................................
8.3.12 Types of Stocktaking..............................................................................................
8.3.13 During the Stocktaking...........................................................................................
8.3.14 After Stocktaking...................................................................................................
8.4
Analytical Procedures...........................................................................................
8.4.1 Introduction............................................................................................................
8.4.2 Nature and Purpose of Analytical Procedures........................................................
8.4.3 Analytical Procedures as Risk Assessment Procedures..........................................

PRINCIPLES OF AUDITING

xiv

217
218
224
229

235
235
235
234
235
236
236
237
240
241
242

243
243
243
243
245
245
246
247
248
248
249
249
252
252
254
254
254
254
255
255
263
264
265
265
266
266
267
270
271
271

271
271
272


8.4.4
8.4.5
8.4.6
8.4.7
8.4.8
8.4.9
8.4.10
8.4.11
8.4.12
8.4.13
8.4.14
8.4.15
8.4.16
8.4.17
8.4.18
8.4.19
8.4.20
8.4.21
8.5
8.5.1
8.5.2
8.5.3
8.5.4
8.6
8.6.1

8.6.2
8.6.3
8.6.4

Analytical Procedures as Substantive Procedures.................................................. 273
Suitability of Using Substantive Analytical Procedure Given the Assertions...... 273
The Reliability of the Data.................................................................................... 274
Whether the Expectation in Sufficiently Precise................................................... 275
Amount of Difference of Recorded Amount from Expected Values that is Acceptable 275
Analytical Procedures in the Overall at the End of the Audit..............................
276
Investigating Unusual Items................................................................................. 276
Public Sector Perspective.....................................................................................
277
The Practice of Analytical Procedures.................................................................
277
Important Ratios..................................................................................................
277
Other Areas that Auditors may Examine as part of the Analytical Procedures.... 278
Auditing Procedures for Post Balance Sheet Events and Contingencies.............. 279
Introduction..........................................................................................................
279
Post Balance Sheet Events.................................................................................... 279
Accounting Treatment.......................................................................................... 281
Auditing Procedures.............................................................................................
281
Auditing Procedures for Subsequent Events Discovered after the date of the Audit
Report but before the Financial Statements are Issued............................................ 282
Audit Procedures for Subsequent Events Discovered after the Financial Statements
have been Issued but before their Laying before the Members or Equivalent.......... 283

Contingencies.......................................................................................................... 284
Definition................................................................................................................ 284
Accounting Treatment............................................................................................ 285
Auditing Procedures............................................................................................... 286
Auditing Procedures for Going Concern Basis in Financial Statements............... 287
Quality Control for Audit Work............................................................................ 294
Introduction........................................................................................................... 294
Quality Control at the Audit Firm Level............................................................... 295
Quality Control at the Individual Audit Assignment Level.................................. 296
Review................................................................................................................... 297

CHAPTER NINE
9.0
AUDITING IN A COMPUTERISED ENVIRONMENT ............................... 301
9.1
Computers in Audit Administration…………………………………………..... 301
9.1.1 Working Papers.........………………………………………………………........ 301
9.1.2 Statistical Sampling and Analytical Procedures……………………………………303
9.1.3 Decision Support Systems.............………………………………………… ....... 303
9.2
The Auditors‟ Approach........................…………………………………… ....... 303
9.2.1 Introduction...................................................………………………………..
303
9.2.2 Knowledge and Skills.....................................................................................
304
9.2.3 Planning, Controlling and Recording...............................................................
304
9.2.4 Internal Control Evaluation...............................................................................
306
9.2.5 Test of Controls................................................................................................

307
9.2.6 Review of Financial Statements........................................................................
307
9.2.7 Working Papers.........…………………………………………………………
307
9.3
Computer Assisted Audit Techniques (CAATS).............................................
309
9.3.1 Introduction......................................................................................................
309
9.3.2 Using the Right Files........................................................................................
310
9.3.3 Audit Interrogation Software............................................................................
310
9.3.4 Test Data............................................................................................................
310

PRINCIPLES OF AUDITING

xv


9.3.5
9.3.6
9.3.7
9.3.8
9.4
9.4.1
9.4.2
9.4.3

9.4.4
9.4.5
9.4.6
9.4.7
9.4.8
9.4.9
9.4.10
9.4.11
9.4.12
9.4.13
9.4.14
9.4.15
9.5
9.5.1
9.5.2
9.5.3
9.5.4
9.5.5
9.5.6
9.5.7
9.5.8
9.5.9
9.5.10
9.6
9.6.1
9.6.2
9.6.3
9.6.4
9.6.5
9.7

9.7.1
9.7.2
9.8
9.9
9.10
9.11
9.12
9.13

Embedded Audit Facilities.................................................................................
311
Simulation..........................................................................................................
312
Program Logic and Coding................................................................................
312
Knowledge-based Systems.................................................................................
312
Controls in a Computer Environment.................................................................
313
Introduction........................................................................................................
313
Examples of Application Controls.....................................................................
314
Controls Over Input...........................................................................................
314
Controls Over Authorization Involve Checking................................................
315
Controls Over Processing...................................................................................
315
Controls Over Master Files and Outstanding Data............................................

316
Examples of General Controls............................................................................
316
Controls Over Development of Computer Application......................................
316
Controls to Prevent or Detect Unauthorized Changes to Programs.....................
317
Controls to Ensure that all Program Changes are Adequately Tested and
Documented.........................................................................................................
317
Controls to Prevent or Detect Errors During Program Execution.......................
318
Controls to Prevent Unauthorized Amendment to Data Files.............................. 318
Controls to Ensure that Systems Software is Properly Installed and maintained... 319
Controls to Ensure that proper Documentation is kept............................................ 319
Controls to Ensure Continuity of Operation............................................................ 319
Controls in On-line and Real Time Systems........................................................... 319
Nature of On-line and Real-time Systems............................................................... 319
Controls in Real-time Systems................................................................................ 320
Segregation of Duties.............................................................................................. 320
Data File System..................................................................................................... 320
Program Security...................................................................................................... 321
Back-ups.................................................................................................................. 321
Database Management Systems (DBMs)................................................................ 322
Controls to Prevent Unauthorized Changes to Programs........................................ 322
Controls to Prevent or Detect Errors During Operation.......................................... 322
Controls to Ensure Integrity of the Database System.............................................. 323
Control Problems in Small Computer Systems........................................................ 323
Summary of the Control Problems........................................................................... 323
Lack of Planning Over the Acquisition and use of PCs.......................................... 324

Standards................................................................................................................ 325
Lack of Documentation Evidence........................................................................... 326
Lack of Security and Confidentiality...................................................................... 326
Application Controls and General Controls in Computer-based Systems.............. 327
Application Control................................................................................................. 327
Controls Over Input................................................................................................. 327
General Controls...................................................................................................... 329
Techniques used by Auditors to Record and Evaluate Manual and Computer-based
Accounting Systems................................................................................................. 330
Purpose of Tests of Control..................................................................................... 330
Nature of Test of Controls....................................................................................... 331
Systems Development.............................................................................................. 331
Chapter Summary..................................................................................................... 334

PRINCIPLES OF AUDITING

xvi


CHAPTER TEN
10.0 THE AUDITOR’S REPORT ON FINANCIAL STATEMENTS.....................
10.1 Introduction……………………………………………………………….....
10.2 Basic Elements of the Auditor‟s Report……………………………………...
10.2.1 Title.......................................………………………………………………..
10.2.2 Addressee..........................…………………………………………………..
10.2.3 Opening or Introductory Paragraph………………………………………….....
10.2.4 Scope Paragraph.......………………………………………………………......
10.2.5 Opinion Paragraph...……………………………………………………….......
10.2.6 Date of Report...........................................................................……………......
10.2.7 Auditor‟s Address................................................................………..............

10.2.8 Auditor‟s Signature..............................................................................................
10.3 Unqualified Auditor‟s Report..............................................................................
10.4 Modified Reports.................................................................................................
10.4.1 Matters that do not Affect the Auditor‟s Opinion – Emphasis of Matter............
10.4.2 Matters that do affect the Auditor‟s Opinion.......................................................
10.5 A Qualified Opinion.............................................................................................
10.6 A Disclaimer of Opinion.......................................................................................
10.7 An Adverse Opinion..............................................................................................
10.8 Disclosures in an Opinion Other Than Unqualified Opinion................................
10.9 Circumstances that may Result in Other Than an Unqualified Opinion...............
10.9.1 Limitation of Scope...............................................................................................
10.9.2 Illustrations of Qualified Opinions relating to Limitation of Scope......................
10.10 Chapter Summary...................................................................................................
CHAPTER ELEVEN
11.0 INTRODUCTION TO PUBLIC SECTOR AUDIT...........................................
11.1 Appointment, Powers and Functions of the Auditor-General for the Federation,
States and Local Governments……………………………………………….
11.1.1 Appointment of Auditor-General................................................…………….
11.1.2 Acting Capacity.......................................................................………………
11.1.3 Powers and Functions of Auditor-General…………………………………....
11.1.4 Free Access to Books and Accounts...……………………………………….
11.1.5 Audit of Public Accounts..................................................................................
11.2 Auditing for Compliance with legislative and Related Authorities...................
11.2.1 Functions ............................................................................................................
11.2.2 Composition of Office of Auditor-General.........................................................
11.2.3 Audit Queries and Alarms...................................................................................
11.3 Role of Public Accounts Committee (PAC) in the Audit Process.....................
11.3.1 Power to Conduct Investigation........................................................................
11.3.2 Power as to Matters or Evidence..........................................................................
11.3.3 Basis of PAC Activities........................................................................................

11.3.4 Problems of PAC..................................................................................................
11.4 Internal Audit in the Public Sector........................................................................
11.4.1 Objectives and Scope.............................................................................................
11.4.2 Operation of Internal Audit..................................................................................
11.4.3 Responsibilities of Internal Audit........................................................................
11.5 Due Process and Public Procurement Act............................................................
11.5.1 Functions of the Council.......................................................................................
11.6 Establishment of the Bureau of Public Procurement............................................

PRINCIPLES OF AUDITING

xvii

338
338
338
339
339
340
340
341
342
343
343
343
344
345
346
347
347

347
347
349
349
349
354

358
358
358
359
359
360
360
361
362
363
364
365
365
365
366
366
366
367
368
368
369
370
370



11.6.1 The Objectives of the Bureau...............................................................................
11.6.2 Functions of the Bureau........................................................................................
11.7 Chapter Summary.................................................................................................

370
371
372

CHAPTER TWELVE
12.0 ASSURANCE REPORTING............................................................................
12.1 Assurance Engagements..........................……………………………………
12.1.1 Procedures on the Assurance Engagements…………………………………
12.1.2 Assurance Report.................................……………………………………...
12.1.3 Assurance Report Basic Elements……………………………………………
12.2 Subsequent Events Review........……………………………………………..
12.3 Truth and Fairness Assessment of Financial Statements............………….....
12.3.1 Regarding the Presentation of the Financial Statements..................................
12.3.2 Regarding the Asset..........................................................................................
12.3.3 Regarding the Liabilities and Any Contingent Liabilities.................................
12.3.4 Regarding the Results Shown by the Profit and Loss Account.........................
12.4 Audit Completion.............................................................................................
12.4.1 Final Review of Profit Financial Statements.....................................................
12.4.2 Completion of Field Work.................................................................................
12.4.3 Drafting the Audit Reports.................................................................................
12.4.4 Issues Documentation.........................................................................................
12.4.5 Audit Completion Checklist................................................................................
12.4.6 Signature.............................................................................................................
12.4.7 Reporting to the board and to Management........................................................

12.4.8 Debriefing...............................................................................................................
12.4.9 Consideration of Desirability of Re-appointment...................................................
12.5 Reviewing the Financial Statements.......................................................................
12.6 Introduction to International Financial Reporting Standard (IFRS).......................
12.6.1 Structure of IFRS....................................................................................................
12.6.2 Adoption of IFRS...................................................................................................
12.6.3 Presentation of Financial Statements under IFRS..................................................
12.6.4 Elements of Financial Statements (IASI)...............................................................
12.6.5 Conceptual Framework for Financial Reporting....................................................
12.6.6 Disclosure of Information in Financial Statements under IFRS............................
12.6.7 IFRS Implementation Issues..................................................................................
12.6.8 Practical IFRS Implementation Issues for Emerging Economies.........................
12.6.9 The Expectations for Companies on the Implementation of IFRS.......................
12.6.10 Guidelines for Effective Transition to IFRS.........................................................
12.7 Chapter Summary...................................................................................................

375
375
375
376
376
377
378
379
379
379
380
380
380
380

381
381
381
381
381
382
382
382
383
383
384
384
384
385
386
387
390
391
392
396

BIBLIOGRAPHY..........................................................................................................

397

PRINCIPLES OF AUDITING

xviii



PAPER 9

PRINCIPLES OF AUDIT

AIMS:
To examine candidates‟:


Understanding and appreciation of audit processes from the planning stage to the reporting stage;



Understanding of the risks associated with audit;



Understanding of the nature and essence of Audit;



Ability to carry out audit in computerized operating and accounting systems;



Appreciation of the audit needs of various organizations;



Understanding of the regulatory framework and ethical issues of auditing; and




Ability to effectively communicate audit findings.

OBJECTIVES:
On completion of this paper, candidates should be able to:
(a)

Appreciate and describe the function and purpose of internal and external financial reporting system;

(b)

Highlight the role of audit in external financial reporting;

(c)

Explain the principles of internal control;

(d)

Appreciate control objectives for an accounting system under focus;

(e)

Measure audit risk and formulate appropriate audit procedures;

(f)

Draw logical conclusions from the results of conducted audit tests; and


(g)

Formulate simple and preliminary reports relating to audit assignments.

STRUCTURE OF THE PAPER
The paper will be a three-hour paper divided into two Sections:
Section A:

(50 Marks)- This shall consist of 50 compulsory questions made up of 30 Multiple-choice
Questions and 20 Short Answer Questions covering the entire syllabus.

Section B:

(50 Marks) - This consists Six Questions out of which candidates are expected to answer any
four. Each of the questions attracts 12.5 marks

CONTENT

1.

Auditing Principles and Theory
(i)
Basic principles and concepts in auditing.
(ii)
Differences between auditing and accounting.
(iii)
Auditing and other services.
(iv)
Impact of Law and Accounting Standards on audit.
(v)

Concepts of “true and fair view”, materiality, judgment and audit risks.

2.

Rights, Duties and Responsibilities of Auditors
10%
(i)
Appointment, removal and independence of auditors.
(ii)
Auditors‟ qualification.
(iii) Auditors‟ responsibilities for objectivity, integrity, confidentiality, skill, care,
and competence.

PRINCIPLES OF AUDITING

xix

5%


3.

Regulatory Framework and Ethical Issues in Auditing
5%
(i)
Scope of audit function under the Companies and Allied Matters Act Cap C20
Laws of the Federation of Nigeria, 2004; Banks and Other Financial
Institutions Act 1991; Insurance Act 2003.
(ii)
Audit Implications of Professional Pronouncements and Guidelines.

(iii)
Conflicts of interest, beneficial holding and personal financial relationships.
Candidates are advised to refer to Acts, Legislations and Regulations, etc. that
are
relevant to their home countries. For example, Nigerian candidates
should refer to Acts peculiar to Nigeria.

4.

Professional Ethics
5%
(i) Fundamental principles of ICAN Code of Ethics and Conduct.
(ii) Detailed requirements and application of professional ethics in the conduct of
auditor‟s independence, objectivity and integrity as set out in ICAN‟s Code of
Ethics and Conduct.
(iii) Auditors‟ responsibilities with regard to confidentiality as set out in ICAN‟s
code of Ethics and Conduct.

5.

Auditor’s Liability
5%
(i)
Definition and sources of Auditor‟s liability.
(ii)
Auditor‟s liability for negligence under common law, statute, civil and
criminal law.

6.


Internal Control
15%
(i) Objectives of an internal control system.
(ii) Types of internal control.
(iii) Inherent limitations of internal control system.
(iv) Importance of internal control to auditors.
(v) Control procedures to meet specified objectives for each of the following
functional areas: purchases and trade creditors, sales and trade debtors, wages
and salaries, tangible/ fixed assets, stocks, bank receipts and payments, and cash
receipts and payments.
(vi) Application controls and general controls in computer-based systems and
identification of
the objectives of each control type.
(vii) Typical control problems encountered in small computer-based systems.
(viii) Techniques used by auditors to record and evaluate manual and computer-based
accounting systems.
(ix) Format and contents of Internal Control Questionnaire (ICQ‟s) and internal
Control
Evaluation Questionnaires (ICEQ‟s)
(x) Purpose of tests of control.
(xi) Tests of control and substantive procedures.

7.

Audit Tests and Sampling Techniques
(i)
Relevance of sampling to the auditor.
(ii)
In-depth tests, graphing tests and sampling techniques.
(iii)

Testing of the system of internal controls.

PRINCIPLES OF AUDITING

xx

5%


(iv)
(v)
(vi)

Compliance test, walk through test and substantive tests.
Sampling selection methods – random, systematic and haphazard selection.
Main factors affecting sample size.

8.

Audit Planning, Evidence and Verification Procedures
15%
(i)
Physical examination.
(ii)
Third party confirmation.
(iii) Audit programmes to meet specific audit objectives with regard to the
following
balance sheet items: fixed assets, investments, trade debtors,
prepayments, bank and cash, trade creditors, accruals, long-term liabilities and
provisions.

(iv)
Types of audit tests.
(v)
Importance of evidential material in the audit process.
(vi)
Factors that influence the reliability of audit evidence.
(vii) Vouching process.
(viii) Audit observations and Management representation.
(ix)
Internal Control Report/ Letter of Weaknesses.
(x)
Verification of Current Assets and Liabilities.
(xi)
Audit of intangible assets, such as goodwill, patents, trademarks, copyrights,
franchise etc.
(xii) Quality control and peer review.

9.

Audit Practice
(i)
Preparation, control, maintenance of audit files and working papers.
(ii)
Evaluation of audited accounting systems using Internal
Questionnaires, and checklist.
(iii)
Verification of Balance Sheet items.

5%
Control


10.

Audit of Computerized Systems
5%
(i) Approach to computer audit – audit through the computer/audit round the
computer
(ii) Audit Trail.
(iii) Computer Assisted Audit Techniques (CAAT).
(iv) Security and computer crimes; prevention and control.

11.

Introduction to Public Sector Audit
(i)
Auditor-General of the Federation, State and Local Government –
appointment, powers and functions.
(ii)
Auditing for compliance with legislative and related authorities.
(iii)
Public Accounts Committee.
(iv)
Internal Audit function in public sector.
(v)
Due Process and the Public Procurement Act, 2007.

PRINCIPLES OF AUDITING

xxi


5%


12.

Assurance Reporting
(i)
Subsequent events review.
(ii)
Evaluation of going – concern status.
(i)
Management Representations Appraisal.
(ii)
Truth and fairness assessment of financial statements.
(iii)
Audit Committee – composition and functions.

5%

13.

Audit Report
10%
(i)
Standard audit report.
(ii)
Qualification in audit reports.
(iii) Forms and content of auditors‟ report with an unqualified opinion on the
financial statements of a company.
(iv)

Circumstances which may warrant the auditor to issue a report with:
 A Qualified opinion.
 An Adverse opinion.
 A disclaimer of opinion.

14.

Audit Completion
5%
Purpose and nature of carrying out an overall review of the financial statements prior
to expressing an audit opinion and outline the purpose and nature of:
(i)
Application of analytical procedures.
(ii)
A review of opening balances and comparatives.
(iii)
A review of events after the end of the reporting period.
(iv)
An evaluation of going concern.

RECOMMENDED TEXTS
1.
ATSWA Study Pack on Preparation and Audit of Financial Statements
2.
3.

Aguolu Osita - Fundamentals of Auditing, Rex Charles & Patrick Ltd, Nimo, Anambra State,
Nigeria.
Okai I.J (1966)
Auditing for you: National Science and Technology press csir Accra.


OTHER REFERENCE BOOK
Woolf E. - Auditing Today, Prentice-Hall International.

PRINCIPLES OF AUDITING

xxii


CHAPTER ONE
THE NATURE, PURPOSE AND SCOPE OF AUDITING

CHAPTER CONTENTS
a.
b.
c.
d.
e.
f.
g.
h.
i.
j.
k.
l.
m.
n.
o.

Introduction

Historical Background
Auditing Today
Definition of auditing
Why the need for audit
Objectives and general principles governing an audit of financial statements
Advantages of Audit
Disadvantages of Audit
Limitations of audit
The expectation gap
The structure of an audit firm
Types of audit
The chronology of audit
Auditing and other services
The Agency theory and Auditing

OBJECTIVES
After the completion of this chapter, the reader should be able to:
a. explain the purpose and types of audit;
b. understand in general terms what an audit is and put into context some basic audit
techniques;
c. recognize that there are theoretical considerations underlining audit practice
d. outline and explain the main stages of an audit; and
e. outline the functions of audit committee;

1.1

INTRODUCTION
In this manual, we shall be studying the audit of accounts (end products of
stewardship function) which are used by managers of businesses and organizations to
communicate how their businesses have been managed. An unqualified or favourable

audit report communicates to stakeholders that their business interests have been
managed well and that they can rely on the picture that the financial statements
portray.

Auditing is therefore a very onerous and demanding task and a high sense of
competence, integrity, skill, experience and technical knowledge must be brought to
PRINCIPLES OF AUDITING

1


bear on the process of auditing. Auditors may find themselves having to gather
appropriate and sufficient evidence to enable them make informed judgements about a
whole range of business situations. This can be best achieved if auditors understand
how organizations operate and the environment in which they operate. Auditing is
therefore a practical and real-world subject.

1.2

HISTORICAL BACKGROUND
Evolution of auditing dates back to the medieval ages. Records have it that in ancient
Egypt and Rome, people were employed to review work done by tax collectors and
estate managers. It is also on record that in medieval Britain, an independent person
was employed by the Feudal Barons to ensure that returns from tenant farmers
accurately reflected revenues received from the estates.

In those eras, the emphasis was on detection of fraud and irregularities. Further
developments in the discipline have changed the forms of auditing and made it more
demanding and sophisticated.


1.3

AUDITING TODAY
It has been recognized that whenever a fiduciary relationship with financial
implications exists, there is a need for a knowledgeable outsider to independently and
objectively review the accounts of stewardship and to express an opinion as to their
honesty or otherwise.

The accounts of stewardship, within the context of a company, is how the directors
have dealt with the investments or assets of the company on behalf of the
shareholders, the end product of the stewardship, being the financial statements
(Profit and Loss Account, Balance Sheet, Cash Flow statement, Value Added
Statement and Directors Report).

Auditing of today is deeply rooted in the concept of separation of ownership from
management in the affairs of companies. There is now the urgent need to safeguard
the interests of the owners (the shareholders) who are not involved in the day-today
decision made by the management (the board of directors).

PRINCIPLES OF AUDITING

2


Now the services of professional accountants are being employed to take up the
demanding task of independent examination of financial records produced by
management and to express opinion as to their truth and fairness.

In Nigeria, Companies and Allied Matters Act CAPC20LFN2004 has made it an
obligation for every public liability company to have its annual financial statements

audited before circulating them to members. Specifically, Section 357 (1) states as
follows: „Every Company shall at each general meeting appoint an auditor to audit the
financial statements of the company….‟ The same can be said for Ghana, where the
Companies Code (1963) Act 179 (under review) has a provision that has made audit
of financial statements of public interest entities a statutory requirement. Other West
African countries have similar legislations that make audit of financial statements of
public companies a mandatory requirement.

The appointed auditor (who should be a member of a recognized professional
accountancy body and duly licensed to practice and not disqualified by any
legislation) is expected to express an opinion on the truth and fairness of the profit
and loss account and the balance sheet, both of which should be prepared by the
directors and presented to the shareholders at an annual general meeting.

1.4

DEFINITION OF AUDIT
Auditing is defined as a process, carried out by an appointed qualified person or body,
whereby the records and financial statements of an entity are subjected to independent
examination in such detail as will enable the auditor form an opinion as to their truth
and fairness of the financial statements.
The key words and phrases in this definition are further explained as follows:
“Independent Examinations” means the conduct of the audit should be carried out
independent of the person who provided the records and the financial statements. The
work of the auditor should not under any circumstance, be influenced by the client.
An auditor cannot give an unbiased opinion unless he is independent of all the parties
involved. Not only must the auditor be independent in fact and in attitude of mind,
but he must also be seen to be independent in person.

PRINCIPLES OF AUDITING


3