Administrative law encompasses laws and legal principles governing the administration and regulation of governmental authorities (both Federal and Provincial). Such authorities are delegated power by Parliament (or in the case of a provincial authority, the provincial legislature) to act as agents for the executive. Generally, administrative authorities are created to protect a public interest rather than to vindicate private rights. Governmental authorities must act within Constitutional parameters. These and other limits have been codified into statutes such as the Constitution of Pakistan and provincial analogs likewise Law of Writs