Ray C. Rist was a senior evaluation officer in the World Bank for many years. He has served as university professor at The Johns Hopkins University, Cornell University, and George Washington University. His career has included fifteen years in the U.S. government in both the executive and legislative branches. He has authored, edited, or co-edited numerous books and written over one hundred articles. In addition, he is the editor for Transaction's Comparative Policy Evaluation series.||Nicoletta Stame teaches social policy at the University ""La Sapienza,"" Rome. She was a co-founder and first president of the Italian Evaluation Association. Her previous publications include L'esperienza della valutazione