The parliamentary system is based on two pillars, namely the duality of the executive authority, and the cooperation and balance between the legislative and the executive authorities. The balance between the powers is achieved through the means of influence that each authority possesses towards the other. The executive authority has the power to dissolve parliament in case if the legislative authority does not carry out its tasks, and in return the legislative authority has means of influencing the work of the executive authority including parliamentary interrogation, where legislative authority practices this means of influence when the executive authority stumbles or lags in the practicing of its work, or if there is a failure or mistakes. In such cases the parliamentary interrogation is done to ensure accuracy and caution in exercising their tasks. Thus the parliamentary interrogation contributes an effective role in correcting the government route, so our study addresses the issue of the effectiveness of parliamentary questioning in correcting the government route as it is referred in the Iraqi constitution 2005.