The General Assembly ordinarily meets every three years. The Agenda covers the election of the Executive Committee, assessment of progress made in the implementation of IUBS scientific programmes and collaboration with other international organisations, allocation of funds, etc.
The General Assembly elects the Executive Committee of the Union, after receiving recommendations from a Nominations Committee of seven that consists of the Past President and six individuals named by the Officers from among the delegates present. Nominations should enhance diversity (scientific, geographic, and state of development) among Executive Committee members.
The General Assembly is flanked by a scientific symposium organised in cooperation with the National IUBS Committee of the host country.
With the consent of the Executive Committee, the President of the Union, who is also President of the General Assembly, may summon an Extraordinary Meeting of the General Assembly for special purposes. The President must summon an Extraordinary Meeting when requested by at least one-third of the National Members of the Union.