The public authorities, establishment of control is an imperative. In science administration are known three main forms of control: control the political, administrative and judicial review. State control is exercised and based on a set of principles that ensure the legality, accuracy, disclosing secrets protected by law, cooperation between supervisory bodies and the inevitability of responsibility in cases of infringement. Parliamentary control over the executive and government political and legal operation is the most complex and expressive application of functional principle of separation of powers. Parliament does not substitute authorities they control, but check if they perform their duties according to law, respecting the rule of law.