Resilience has rapidly become one of the most prominent objectives for the development sector, so ascertaining how best to measure it is an essential task for practioners working in monitoring and evaluation. In this discussion paper, the main insights emerging from the series of large-N Effectiveness Reviews, a set of quantitative studies that aim to evaluate impact and generate learning from a random sample of Oxfam’s projects are outlined. It is also considered how this measurement approach may adapt as ideas about resilience change both within Oxfam and in the development sector at large