The Department for Education (DfE) provided funding for secondary schools to establish short face-to-face summer schools over the 2021 summer holiday, to help them make up for learning lost during the COVID-19 pandemic. Lasting for one or two weeks, summer schools involved a blend of academic learning and enrichment activities and were intended to complement transition work that schools might normally undertake. Schools determined which pupils, from any year group, would most benefit from a summer school, although it was anticipated that there would be a focus on pupils transitioning into year 7. This transition is known to be a challenging one for some pupils, and the impacts of the pandemic increased this challenge. A range of data was collected by the DfE to assess the effectiveness of the summer school programme. CooperGibson Research was commissioned to conduct analysis of survey and management information (MI) data relating to the programme, triangulating findings where possible. This report presents the findings of this analysis.