This paper summarises the research plan for a longitudinal evaluation project conducted on the population of secondary schools and pupils in England. STEM enrichment and enhancement activities are delivered for pupils across the United Kingdom with the aim of improving pupil engagement. These activities give students the chance to explore these subjects as done outside classrooms. The impact of these activities will be evaluated in terms of school and pupil educational outcomes. The study makes use of secondary official datasets—the National Pupil Database. Year 7 cohort will be followed up to their learning trajectories. Research findings from the study will form evidence base for policy and practice and recommendations will be useful for academic and non academic beneficiaries.