Over the past two decades, significant investment has been made into agriculture-related natural resource management research in developing countries. With investors beginning to request the impact of their investments in this research, a review was needed on the economic, social and environmental effects of these projects. Stemming from an effort to address these concerns, this collection of case studies establishes a methodological foundation for impact assessments of NRMR through a discussion of research conducted by the CGIAR around the world. Both micro- and macroprojects are examined to consider the results of these agricultural and development programs at the farm level as well as on a regional scale.