Merrey, D. J. 2001. Impact assessment at the International Water Management Institute (IWMI). Consultative Group on International Agricultural Research (CGIAR). Technical Advisory Committee (TAC). The future of impact assessment in the CGIAR: needs, constraints and options. Proceedings of a workshop organized by the Standing Panel on Impact Assessment of the Technical Advisory Committee, 3-5 May 2000, FAO, Rome, Italy. Rome, Italy: FAO. Annex 2, pp.105-109.

Consultative Group on International Agricultural Research (CGIAR). Technical Advisory Committee (TAC). The future of impact assessment in the CGIAR: needs, constraints and options. Proceedings of a workshop organized by the Standing Panel on Impact Assessment of the Technical Advisory Committee, 3-5 May 2000, FAO, Rome, Italy. Rome, Italy: FAO