The aim of this study was to ascertain the role of internal auditing in organizational effectiveness focusing on Diamond Bank. The specific objectives are; to determine the role of internal auditing in promoting organizational performance of Diamond Bank, to examine the effect of internal auditing in the internal control systems of Diamond Bank,to ascertain the effect of auditors’ independence on the efficiency of internal auditors and to determine the effectiveness of internal auditing in controlling fraud in Diamond Bank. The study used simple survey. The population of study was management and staff of Diamond Bank Plc with a total population of 79 staff while the simple size was 72. Table and percentage were used for analysis while the hypotheses were tested with chi square. The study found that internal auditing improves the credibility of banks, internal auditing has aided in managerial decision making in Diamond Bank and internal auditing has improved the profitability of Diamond Bank. The study recommends that banks should endeavour to keep to professional codes of conduct and ethical considerations as it enhances the activities of internal auditor and in so doing eliminate cases of fraud in the banking sector. Further, there should be audit education among the stakeholders of diverse organizations.



Cover page                                                                              i

Title Page                                                                                ii

Declaration Page                                                                      iii

Dedication                                                                               iv

Acknowledgements                                                                  v

List of tables                                                                            vi

Abstract                                                                                   vii



  • Background to the study                    1
  • Statement of problem                                                     5
  • Objectives of the study 6
  • Research Questions 7
  • Research hypotheses                                                      7
  • Significance of the study 9
  • Scope and limitations of the study           9
  • Definition of Terms                              10



  • Conceptual framework 11
    • The Concept of Auditing                                        11
    • Auditing and Accounting Functions           15
    • Overview of InternalAudit                    16

2.1.4    Overview and principle of Internal control                  20

2.1.5   Purposes of Internal Control                                        22

2.1.6   Objective and Purpose of theInternalAudit                 24

2.1.7   The concept of Audit Independence                              25

2.1.8   Types of Audit Independence                                     29

2.1.9   Safe Guarding Auditors Independence                       32

2.2     Theoretical Frameworkof thestudy                               38

2.3     Empirical Review                                                         39



  • Research design 46
  • Sources of data           46
  • Population of the study                    46
  • Instruments for Data Collections                              47
  • Validationof the instrument                                       48
  • Reliability of the instrument 49
  • Method of data analysis 49



  • Data presentation           50

4.2     Testing of hypotheses                                                     60



  • Summary of findings                    66
  • Conclusion                              67
  • Recommendations                                       68

References                                                                      69

Appendix                                                                       71

Questionnaire                                                                 72




1.1 Background to the Study

At the heart of business establishment, is the audit function; which is evidenced by the fact that all other departments are linked with the internal audit department. The importance of internal audit system cannot be overemphasized where a variety of requirements, processes that are both manual and information communication technology-based (ICT) are used.

Organizations such as the banking sector have recognized internal audit function as a tool for ensuring effective workings of the internal control system. Okolo (2011) describes the internal audit function as an aspect of control mechanism, within a business, manned by specially assigned staff.

In today’s volatile business environment, firms in Nigeria face a wide array of complex business challenges. These challenges come in the form of regulatory compliance, litigation, competitive market pressure, changing technology, investors demand, corporate governance, business ethics and accountability. In a business environment, anyone given the opportunity and the environment can commit fraud. The internal audit staff, in a non-automated or particular environment, may be ill-positioned to investigate fraud. It is established that an internal audit staff who is professionally certificated with the right motivation and training can contribute to the efficiency and effectiveness of the audit department.

Oseni (2014) reveals that an effective internal audit function reduces overheads, identify ways to improve efficiency and minimize exposure to possible losses. According to Lavy (2008), the internal audit provides an independent and objective appraisal of activity for management. Katz (2012) summarizes the core activities of the internal audit as analysis of data, recommendation,counsel and information activities.

He argues that these activities operate to accomplish the mission of organizations. Young (2010) finds out that the internal audit functions assist management in achieving organization’s financial and operating goals by evaluating controls, identifying weaknesses, and providing recommendations through complete and unrestricted access to records, property and personnel.

However, in Nigeria, the audit function in the banking sector has not been fully tapped; consequently, cases of errors and intent to defraud and other fraud cases exist in the industry. It is therefore no wonder that the distress in most banks reflected lack of effective control mechanism of the audit function.

The experiences of failed banks in Nigeria, have called for the reinforcement of internal audit and the strengthening of the controls system. This becomes relevant, given the fact that the banking sector is critical to the survival of any economy. In the light of the above, this study critically appraises the role of internal audit in the management of fraud.

1.2     Statement of the Problem

          The duty of detecting fraud and irregularities lies with the management. This could only be done through an effective and efficient internal audit system. But even with the presence of the internal auditor some problems are still inherent in the Nigerian banking sector that interferes with goal attainment. These include:

  1. Physical cash stolen while signatures are forged in cheques also to steal cash. Out if untimely or inappropriate audit, there are cases of monetary losses due to forged cheques.
  2. Assets are either misappropriated or not accounted for. Due to ineffectiveness of internal auditors cases of assets misappropriation sometimes occur in the banking sector.
  • Frauds perpetuated are only being discovered after a long time. Internal auditors can decide not to reveal the fraudulent activities of staff or management. Such actions are mostly discovered by external auditors after a long while.


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