The Evaluation Cooperation Group https://www.ecgnet.org/

(ECG) is dedicated to harmonizing evaluation work among multilateral development banks (MDBs) by working 
to strengthen the use of evaluation; providing a forum to share lessons; developing harmonized performance 
indicators, and evaluation methodologies and approaches; enhancing the professionalism of evaluation; and 
helping build evaluation capacity.

Membership 

African Development Bank; Asian Development Bank; Black Sea Trade and Development Bank; European Investment Bank; European Bank for Reconstruction and Development; Independent Evaluation Group (IEG), World Bank Group; Independent Evaluation Office (IEO), International Monetary Fund; Inter-American Development Bank; Islamic Development Bank; International Fund for Agricultural Development.

Observers 

Independent Evaluation Office (IEO), Global Environment Facility; Organization for Economic Cooperation and Development (OECD); United Nations Evaluation Group (UNEG)