At this webinar we heard how market systems programmes are attributing change to their interventions. There are a number of clearly described methods to establish attribution, but in practice many market systems development programmes struggle to implement a credible framework to assess attribution of interventions. This webinar examined the merits of a 3-step approach for assessing attribution in market systems programmes. Tim Ruffer, Itad, gave a conceptual introduction to the 3-step approach; Mihaela Balan, consultant, discussed how the GEMS3 project in Nigeria is using the approach; and Adam Kessler, consultant, presented thinking around attribution in the second Business Innovation Facility (BIF2) programme.