This document summarizes Boru Douthwaite's presentation on using theories of change (ToC) to leverage impact. It discusses two interventions: 1) Participatory Innovation Histories which worked well for research learning but less for changing practice, and 2) PIPA (Planning Impact Pathways for Agricultural Research) which uses tools from program evaluation to develop impact pathways and network maps to surface strategies for achieving a shared vision. PIPA was found to provide a language and concepts to link research to impact and build support coalitions. The document discusses next steps like reviving PIPA and measuring its impacts.