1. Introduction
Internal audit has become a crucial function within organizations; however, insufficient attention has been given to study the internal audit compared to external audit. This view is supported by Gendron and Bedard (2006) who noted that academic researchers have tended to focus on external audit as a main control function mandatory while ignoring internal audit. Internal audit effectiveness has not been extensively studied yet, and several researchers have recommended the need for more research on the internal audit effectiveness especially in developing countries (Al-Twaijry et al., 2003; Mihret & Yismaw, 2007; Arena & Azzone, 2007, 2009; Yee et al., 2008; Ahmad et al., 2009), where the internal auditing might play an important role against both the fraud and corruption