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The design of the audit plan so that it can be used to adequately respond to fraud risk is one of the most importantDesigning an audit plan that can respond adequately to fraud risks is one of the most important verifying activities of auditors. In this regard, this study compares triangle, Diamond and Pentagon models of fraud in audit plan adjustment. Fraud triangle model introduces pressure/ motivation, opportunity and justification as fraud dimensions. However, the fraud diamond model considers the capability dimension in addition to the three above-mentioned dimensions to assess fraud risk. The fraud pentagon model also considers the arrogance dimension, in addition to the four above-mentioned dimensions. In order to compare these models, an experimental case has been used. The statistical population of the study is certified public accountants in year 2018. The results show that using the fraud diamond model, as compared to the fraud triangle model, and using the fraud pentagon model, as compared to the triangle and diamond models of fraud, lead to more audit plan adjustment.

Trade credit is one of the most important resources for short term financing. Several different factors affect trade credit one of the most important of which is accounting quality. Therefore, this paper examines the relation between a firm’s amount of trade credit and its accounting quality. Earnings smoothness, conservatism and earnings management are independent variables being used to proxy for accounting quality, and the dependent variable is trade credit. Earning to operating cash flow ration and discretionary accruals are criteria for earning smoothness and earning management respectively. Discretionary accruals are adjusted by Jones model (1995) and conservatism is calculated by Khan& Watts model (2009). Also, trade credit is calculated using payable accruals to total assets ratio. The sample consists of 127 firms listed in Tehran stock exchange from 2008 to 2013. The ordinary least square method is used to test hypotheses. Results show that there is no significant relation between amount of trade credit and earnings smoothness as well as conservatism while there is a significant negative relation between the amount of trade credit and earnings management. In other words, increasing in earnings management decreases trade credit.

Agency problems result from the conflict of interests existing among managers and shareholders. Auditing is considered as an effective way to limit the power of managers in contractual relations. This paper is aimed to investigate the market response to the quality of audit partners work. To test the hypothesis, data from firms listed in Tehran Stock Exchange for the period from 2009 to 2017 are collected and the regression model of cross-sectional data and panel data is used. The results of the first hypothesis of the research confirm that in firms with high quality work of audit partners, revenue has a higher reflection in stock prices. The high quality of the audit partner's work manages and controls information asymmetry and, therefore, the agency's problems related to the firm's management decisions. The second hypothesis that is changing the auditor and selecting a higher quality auditor leads to a positive market reaction, is also confirmed. If the market believes that using higher quality auditors increases the information content of profits and decreases abnormal returns, the audit market response when changing auditors and selecting a higher quality auditing partner is closer to reality (predicted levels). Also, the results confirms the third hypothesis that is auditing by high quality auditing partners has a significant impact on the amount of facilities received. Because the quality of the audit partners’ work has a significant impact on the creditors' view of the risk and timing of the repayment of receivables, therefore the amount of facilities granted increases. On the other hand, the stock price in these firms is a reflection of the real income of them. ‌