This document discusses cognitive psychologist Robert Bjork's research on how testing and interleaving can improve long-term memory retention compared to repeated studying. It explains that testing information requires retrieving it from memory, which strengthens the memory representation and makes it more easily recalled in the future. The document then provides examples of different study patterns and argues that interleaving topics with tests leads to the best test results. Finally, it lists different types of low-risk, frequent testing methods that can be used in the classroom to improve student learning through retrieval practice.