Internal Audit Quality and Fraud Detection Effectiveness in Manufacturing, Banking, and Oil and Gas Sectors: A Systematic Review

Abstract

Fraud remains one of the most significant threats to organizational performance, accountability, and long-term sustainability across both public and private sectors. Despite considerable investments in internal control systems, organizations continue to experience financial losses resulting from fraudulent activities such as financial statement manipulation, procurement fraud, cybercrime, and asset misappropriation. In response to these challenges, internal auditing has evolved beyond its traditional compliance role to become a strategic governance mechanism for risk management and fraud prevention. This paper reviews existing theoretical and empirical literature on the relationship between internal audit quality and fraud detection effectiveness in the manufacturing, banking, and oil and gas sectors. Drawing on Agency Theory, Fraud Triangle Theory, and Institutional Theory, the study examines how factors such as auditor independence, professional competence, technological capability, and regulatory compliance influence organizations' ability to detect and prevent fraud. The review further highlights how industry-specific characteristics shape the effectiveness of internal audit functions and fraud management practices. The findings indicate that organizations with strong internal audit systems are generally more successful in identifying control weaknesses, detecting fraudulent activities, and enhancing overall governance performance. While the banking sector demonstrates relatively higher fraud detection effectiveness due to advanced technology and strict regulatory oversight, the oil and gas sector faces persistent governance challenges despite significant audit investments. Manufacturing firms, on the other hand, continue to grapple with operational vulnerabilities associated with inventory management and procurement processes. By providing a comparative synthesis across multiple sectors, this study extends existing literature that has largely focused on single-industry investigations. The paper concludes that strengthening auditor independence, embracing technological innovation, and investing in continuous professional development are essential for improving fraud detection effectiveness and promoting organizational accountability.