Report of an external program review of CIMMYT conducted concurrently with an external management review by a panel chaired by Ralph Riley. The document also contains a summary of the discussion of both EPR and EMR at the CGIAR meeting of May-June 1989, a transmittal from the TAC chairman with commentary as approved at TAC 47, the response of the CIMMYT Board of Trustees, and a transmittal from the panel chairman. TAC noted and praised the elaborate process for priority setting which CIMMYT had adopted. The panel, with TAC's support, urged greater integration of CIMMYT's three research programs on maize, wheat and economics, particularly with regard to disciplinary research. CIMMYT was encouraged to move upstream, and strengthen its capacit...