Judicial review is the doctrine under which legislative and executive actions are subject to
review (and possible invalidation) by the judiciary. Specific courts with judicial review power must
annul the acts of the state when it finds them incompatible with a higher authority (such as the terms
of a written constitution). Judicial review is an example of the separation of powers in a modern
governmental system (where the judiciary is one of three branches of government). This principle is
interpreted differently in different jurisdictions, which also have differing views on the different
hierarchy of governmental norms. As a result, the procedure and scope of judicial review differs from
country to country and state to state.