The purpose of this report is to compare individual pupil achievement on two high profile sets of assessments in England: the Programme for International Student Assessment (PISA) and the General Certificate of Secondary Education (GCSE). The research in this report will add to well-documented differences between PISA and GCSEs to look at the strength of association between achievements on these two tests from an empirical perspective. A small amount of existing research has shown a relationship between PISA and GCSE within particular subjects (DfE, 2017). This report is an executive summary to the full report. [For the full report, "The Link between Subject Choices and Achievement at GCSE and Performance in PISA 2015," see ED600647.]