How do we prove that agroecology works? Amidst the call for more evidence on the benefits of agroecological practices, assessment tools evaluate progress on the ground and help farmers, advisors, policymakers, and researchers collect impact data. How do we build simple yet contextual tools? How can we aggregate and share this knowledge to foster the transition? Experiences from two indicator systems, OASIS by Agroecology Europe and TAPE by FAO, will ignite interactive discussions on creating collaborative ecosystems of practice to measure agroecological performance, create narratives of change, and use the evidence to bolster implementation for the food and farming system transition.