The CC was not a permanent institution. It convened plenary sessions, of which six CC plenary sessions and two joint CC–Central Control Commission (CCC) plenary sessions were held between the 15th Congress and the 16th Congress. When the CC was not in session, decision-making powers were transferred to inner bodies of the CC itself; the Politburo, Secretariat and Orgburo (none of these bodies were permanent either, but convened several times a months).