An educational intervention's effectiveness is judged by whether it produces positive outcomes for students, with the randomized controlled trial (CRT) as a valuable tool for determining intervention effects. However, the intervention-as-implemented in an experiment frequently differs from the intervention-as-designed, making it unclear whether…

The Yale Summer High School (YSHS) is an experimental program addressed to the development of high-potential, underachieving students from disadvantaged backgrounds. To evaluate the long-term effectiveness of the intervention, an experimental design including random selection of samples, two control groups (one matched for a test of…