Inside IES Research

Notes from NCER & NCSER

Resolve to Study Effectively in 2018

Students of all ages want to study more effectively and efficiently, while teachers want to improve their students’ understanding and retention of important concepts. The Institute’s Cognition and Student Learning (CASL) program has invested in several research projects that test the effectiveness of different strategies for improving learning and provide resources for teachers who want to implement these strategies in their classrooms.  Two strategies that are easy for teachers and students to implement and do not require a lot of time or money are retrieval practice and interleaving.


Retrieval practice (also known as test-enhanced learning) involves recalling information that has been previously learned. Research has shown that when students actively retrieve information from memory (e.g., through low-stakes quizzes), their ability to retain that information in the future improves when compared to other common study strategies like re-reading and highlighting key concepts while reading class texts.

Interleaving is the process of mixing up different types of problems during practice. Unlike blocking, where a student practices the same type of problem over and over again, interleaved practice involves multiple types of problems that require different strategies to solve. In mathematics, where interleaving and blocking have been studied most, blocking is frequently employed at the end of each chapter in a textbook. With interleaved practice, students must choose a strategy to solve the problem and apply that strategy successfully. Research has shown that students learn more when engaged in interleaved practice relative to blocked practice.

For decades, research has shown the benefits of both retrieval practice and interleaving for learning; however, until this point, there were no easily accessible resources that practitioners could turn to for concrete details and suggestions for how to implement these strategies in their classrooms. Two of the IES CASL research projects that have focused on these study strategies (Developing a Manual for Test-Enhanced Learning in the Classroom, PI: Henry Roediger and Interleaved Mathematics Practice, PI: Douglas Rohrer) resulted in guides for teachers that provide information on how to implement these strategies in their classrooms. These guides are freely available through the website (download the Retrieval Practice Guide here and the Interleaving Guide here). With these guides, teachers can learn more about how to use retrieval practice and interleaving to improve their students’ understanding and retention of the concepts they are learning. Happy studying!

By Erin Higgins, NCER Program Officer, Cognition and Student Learning