CIES 2018 Presentation, given by Ben Piper. While there has been recent evidence pointing to the efficacy and cost-effectiveness of pre-primary interventions, there remains little known about how those interventions might work at medium or national scale, nor whether the theoretical impacts of the programs increase, decrease or remain steady over time, nor whether the gains persist into primary school. The endline results from two years of Tayari’s intervention provide longitudinal data on nearly 2500 children who have been evaluated across a range of early learning skills (literacy, numeracy, socio-emotional) at three data points, including their first year of Grade 1. The results presented will explain how Tayari program impacts change over these three data points and determine whether Tayari’s impact persists into Grade 1.