Interleaving Practice

Interleaving Practice boosts discrimination and transfer learning by mixing different problem types within a single session, outperforming blocked practice by a robust 43% in controlled experiments. Unlike the focused repetition of #1 Spaced Repetition, interleaving forces the brain to continually choose the correct strategy, strengthening problem-solving muscles. In a meta-analysis of 20 studies, students who interleaved math problems improved final exam scores by an average of 25 points over those who practiced one topic at a time. This method is cheaper than the typical rival because it requires no special tools—just a shuffled deck of problems. Its effectiveness peaks when combined with active recall, creating a powerful synergy that no standalone technique can match.