A statutory board is an autonomous agency of the Government that is established by an Act of Parliament and overseen by a government ministry. The Act sets out the purposes, powers and rights of the agency. Unlike ministries and government departments that are subdivisions of ministries, statutory boards may not be staffed by civil servants and have greater independence and flexibility in their operations. They are managed by boards of directors whose members usually include businessmen, professionals, senior civil servants and officials of trade unions. The Agency for Science, Technology and Research (A*STAR), the Central Provident Fund Board (CPF), the Housing and Development Board (HDB), the Intellectual Property Office of Singapore (IPOS), the Land Transport Authority (LTA), the Maritime and Port Authority of Singapore (MPA), the National Heritage Board (NHB), and the Urban Redevelopment Authority (URA) are all statutory boards.