There are particular data challenges where evaluations of small-scale innovations make it statistically difficult to understand the impact of schemes on particular population groups. We received evidence from the Traveller Movement, a population disproportionately represented in children’s social care, highlighting risks that lack of precision in monitoring impact on the distinct Traveller, Gypsy and Roma populations masks the different experiences of these groups.33 This mirrors other localised challenges we have seen around monitoring groups which are large in a specific area, but small nationally. The Department agrees that there are issues around what should be done locally monitoring specific communities and what needs to be done centrally, and accepts the need to be alert to that challenge.34