In contrast to full membership, alternate membership of the Central Committee is more varied in its composition, and there are fewer institutional rules governing its membership list. Generally speaking, since the 1980s, alternate membership in the Central Committee is composed of officials of provincial-ministerial rank or sub-provincial (vice-minister) rank. They are selected based on a combination of experience and the institutions that they represent. Many are heads of provincial party departments or party chiefs of big cities. Prominent academics with no political experience and state-owned enterprise chief executives often hold alternate seats on the Central Committee. Some alternate members therefore hold no other political positions. Younger alternate members are also generally seen to be "up-and-coming" national leaders.