This document discusses supporting mutual learning around impact pathways and research to policy processes. It identifies several key barriers to impact, including engaging with non-academic audiences, building mutual learning, developing networks and relationships, and addressing incentives. It outlines lessons learned, such as planning engagement from the start, partnering with non-academic actors, and focusing events on relationship building. The document proposes that the Impact Lab can help by co-producing learning guides on effective engagement approaches and sharing case studies of impact strategies and lessons learned from research teams.