The importance of evidence when making decisions about the implementation of services is now well understood. What Works organisations such as the Education Endowment Foundation and the Early Intervention Foundation place evidence at the heart of their work as a means of distinguishing between programmes that work and those that do not. This evidence base is important in ensuring that resources are used to support the implementation of programmes that will make a difference to the target group. This reliance on evidence is going to be vital in Covid-19 recovery plans, as programmes to support all those affected by the pandemic are put in place.