This document discusses measuring the impact and return on investment for corporate social investment programs. It outlines current trends in monitoring and evaluation that focus on outputs and outcomes. The objectives of impact measurement are to demonstrate performance, accountability and program effectiveness to investors and funders. A variety of qualitative and quantitative indicators across different impact dimensions can be used. Impact should be measured over various time periods from short to long-term. Measuring impact allows organizations to improve programs and make more informed funding decisions.