M.A. Thesis:

The Moderating Role of Internal Audit Function on the Relationship Between Board of Director Characteristics and Business Performance

Companies use different trends to increase their market performance. It is necessary to pay attention to the characteristics of the board of directors in order to create more values for customers as a result of promoting the company's business performance. The purpose of this study is to investigate the effect of the role of internal auditor adjustment on the relationship between the characteristics of the board of directors and business performance in companies listed on the Tehran Stock Exchange. The study was conducted for a five-year period between 1993 and 1997. In this research, financial leverage and company size have also been used as control variables. Sample information of the studied companies was analyzed and analyzed after reviewing the availability of their information by collecting with the help of Class Excel software and with the help of Iveoz software. The research results showed; There is a significant negative relationship between board size and business performance. But there is a positive relationship between gender diversity in the board and duality in the board with business performance, and this relationship is significant. On the other hand, it was expected that there would be a positive and significant relationship between the independence of the board of directors and commercial performance, but due to the conditions of the Iranian capital market, no relationship was found. The internal auditor also negatively correlates the relationship between board size and gender diversity in the board with business performance. But the internal auditor positively adjusts the relationship between board duality and business performance. The internal auditor also had no effect on the relationship between board independence and business performance.

Keywords: Keywords; Internal Auditor - Board Features - Commercial Performanc