CAS is a public non-university research institution, which comprises a system of scientific institutes. It conducts its activities in accord with Act No. 283/1992 Coll., on The Czech Academy of Sciences (CAS), and other legal regulations. Research supported by CAS endeavours to advance knowledge on an international scale while however respecting the current needs of Czech society. The supreme autonomous body of the CAS is the Academy Assembly. The executive body of the CAS is the Academy Council with the President of the CAS at its head. Its permanent advisory body is the Council for Sciences, which deals with the scientific policy of the CAS. These all-academic bodies are always elected for four-year periods.