Major changes have taken place in the Czech waste management system based on national waste treatment legislation adopted in 2001. This legislation revised the interpretation of essential terms, including "waste", so as to reflect new developments in the field of EU waste management. It also adopted new strategies in the area of waste classification and waste management; as a fundamental principle, waste recovery is now given priority over waste disposal. Waste management plans have become a critical component of the Czech waste management system. The powers and responsibilities of municipal councils and State authorities have also been re-organised.