(UNESCAP, formerly the Economic Commission for Asia and the Far East or ECAFE), and non-regional developed countries. Starting with 31 members at its establishment, by 2019 ADB had 69 members.

The ADB was modeled closely on the World Bank and uses a weighted voting system, in which votes are distributed in proportion to members' capital subscriptions. ADB releases an annual report that summarizes its operations, budget, and other materials for review by the