Question 1

What is interleaved practice in studying?

Accepted Answer

Interleaved practice (interleaving) means mixing different subjects, topics, or problem types within a single study session rather than completing all practice on one topic before moving to the next (blocked practice). For example, instead of doing 30 maths problems of the same type, you mix three problem types in rotation. Research by Rohrer and Taylor (2007) found interleaving produced 40–60% better retention on delayed tests.

Question 2

Why does interleaving feel harder than blocked practice?

Accepted Answer

Interleaving feels harder because it requires retrieving the correct strategy for each problem type rather than applying the same strategy repeatedly. This additional difficulty — called a "desirable difficulty" — is the mechanism through which it produces better long-term retention. The extra cognitive effort of switching strengthens memory encoding and builds discriminative ability between related concepts. Students consistently rate interleaving as less effective even when it produces demonstrably better test results.

Question 3

How do I start using interleaving in my study sessions?

Accepted Answer

Start by identifying 2–3 related subjects or topic types that you already have some familiarity with. Use the Interleaved Scheduler tool to generate a rotation. Spend 15–25 minutes per subject block before switching. Avoid interleaving completely new material — learn it in a blocked session first, then introduce it into your interleaved rotation at the review stage. Use the same approach for maths problem types: collect mixed problem sets rather than doing all of one type.

Interleaving Study Technique