This report is now available for download.
The study is based on a review of nearly 400 sources, including policy papers, project documents, and research studies. We have approached the subject from a broadly historical perspective, tracing changes in policies and strategies from the 1970s to the present as policy makers, implementation agencies and development partners learned from experience. The authors also traced the results and outcomes of associated research programs and identified knowledge gaps. They provide recommendations regarding policies and implementation strategies, and for research.