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 macro projects are examined to consider the results of these agricultural and development programs at the farm level as well as on a regional scale.