Judicial powers not committed to the Administrative and Constitutional Court System are vested with the Civil and Criminal Court System, a structure consisting of civil courts on the one hand and criminal courts on the other hand. Civil courts try all cases in which both the claimant and the respondent are private citizens or corporations, including but not limited to contract and torts disputes: Austria's legal system, having evolved from that of the Roman Empire, implements civil law and therefore lacks the distinction between courts of law and courts of equity sometimes found in common law jurisdictions. Civil courts do not try suits against the federation or its states in their capacity as administrative units, but only when acting in the form of private law.