مقالات زبان اصلی

مقالات زبان اصلی

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An Analytical Model for External Auditor Evaluation of the

Internal Audit Function Using Belief Functions


University of Central Florida - Kenneth G. Dixon School of Accounting
University of Central Florida - Kenneth G. Dixon School of Accounting
University of Kansas - Accounting and Information Systems Area

September 2006

The primary purpose of this paper is to advance research in internal audit (IA) evaluation by developing an IA assessment model that considers interrelationships among specific factors used by external auditors when evaluating the strength of the IA function. The model is built on three factors previously identified by auditing standards and prior academic research: Competence, Work Performance, and Objectivity (SAS 65 1991; Messier and Schneider 1988; Krishnamoorthy 2002). Our model generates an overall judgment concerning the strength of the IA function that can aid the external auditor in assessing the reliability of a client's internal control system. Because evaluating the IA function entails a process of gathering items of evidence pertaining to each IA factor and aggregating the evidence to make an overall judgment, we develop the IA assessment model using a conceptual framework based on the prior literature and develop an analytical expression under the belief function framework. By using this framework, we overcome limitations of prior research regarding the modelling of interrelationships among factors and regarding difficulties in application. The results of our analysis revealed that modelling the “And” relationship is essential for assessing the strength of the IA function. As far as interrelationships are concerned, the analysis revealed that when the three factors have a strong or a perfect relationship, the strength of the IA function remains high even if we have positive or negative evidence about one of the factors. This result holds as long as we have high levels of beliefs about the other two factors

Keywords: Internal Audit, Belief Functions, Evidential Reasoning Approach, Reliance Decision

JEL Classifications: M49, C11, C51, G34

Working Paper Series


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