At the beginning of the AGE’IN project the mutual objective was clear: we wanted to detect elderly people experiencing loneliness and develop actions in our neighbourhoods to connect them. But how do you monitor the process you work on in a neighbourhood? How do you visualise change in the short and long term? How do you show that the interventions you are developing, have an impact? We decided it was more valuable to work with ‘impact monitoring’ tools rather than ‘impact measurement’ methodologies. We wanted to propose a detection strategy, test our hypothesises, adapt the strategy when necessary and end up with a framework that has a strong impact on our local communities. The ‘Theory of Change’ proved to be a framework that answered these questions.