The COSO model (Committee of Sponsoring Organization of the Treadway Commission) The American senator TREADWAY, the founder and developer of this model, initiated an important research over internal control and its role in the organizations life, creating in USA the “Treadway commission”, on which recommendation the Organizations Sponsoring Committee was created, known nowadays as COSO. It has reunited the competences of professionals from the external audit, internal audit and big American corporations and elaborated a paper entitled “The code of the internal control”, paper which defines what should be understood from the internal control and concludes that