Prior to 1919, the United States, Canada and Australia had adopted the concept of judicial review by their courts, following shared principles of their similar common law legal systems, which they, in turn, had inherited from British colonial law.
The organization and competences of both courts were influenced by constitutional theories of Hans Kelsen.
[6] Subsequently, this idea of having a separate special constitutional court that only heard cases concerning the constitutionality of the national legislature's acts became known as the Austrian System, and it was subsequently adopted by many other countries e.g. Liechtenstein (1925), Greece (1927), Spain (1931), Germany (1949) etc.
It is located in the same building as the Kammergericht (Oberlandesgericht) and is authorized by Article 84 Constitution of the city-state of Berlin [de].
Constitutional and charter courts used to hear cases relating to conformity with regional constitutions or charters of laws adopted by regional legislatures and governors' decrees, and in this category of cases constitutional and charter courts were courts of single instance.