Report of the IMPACT Assessment and Evaluation Group (IAEG) to TAC 77, a meeting where merger of IAEG and TAC were discussed. The report describes the progress of various IAEG projects, including the impact of germplasm improvement on food production, integrated pest management research, poverty alleviation, and the impact of CGIAR innovations on the environment.The report also describes the initiation of a study, in collaboration with the NARS Secretariat and ISNAR, of CGIAR impact on the scientific capacity of the NARS, and other work. It covers the origins and history of the IAEG, and its current modus operandi