Local people can generate their own numbers – and the statistics that result are powerful for them and can influence policy. Since the early 1990’s there has been a quiet tide of innovation in generating statistics using participatory methods. Across all sectors from local to national, participatory statistics are being generated in the design, monitoring and evaluation, and impact assessment of development interventions. This book, by describing policy, programme and project research, aims to provide impetus for the adoption and mainstreaming of participatory statistics within international development practice. It lays down the challenge of institutional change that allows a win-win outcome in which statistics are part of an empowering process for local people and a valuable information flow for those open to it in aid agencies and government departments.