The Preparatory Committee (PrepCom) held its first substantive session in New York from 4-8 March 1991. This session defined the objectives and themes of the Conference, and proposed convening expert group meetings, regional population conferences and two additional sessions of the PrepCom. The PrepCom identified six clusters of priority issues: population, environment and development; population policies and programmes; population and women; family planning, health and family well-being; population growth and demographic structure; and population distribution and migration. These clusters were addressed by a series of expert group meetings organized by the Population Division of the Department of Economic and Social Information and Policy Analysis of the United Nations Secretariat, in consultation with UNFPA. Another source of input was a series of regional population conferences that were held in Asia, Africa, Europe, Latin America and the Caribbean, and the Middle East.