Interleaving Study Technique

What is interleaved practice in studying?

Interleaved practice mixes different subjects or problem types within a single study session rather than completing all practice on one topic before moving to the next (blocked practice). Kornell and Bjork (2008) found interleaving produced 40–60% better performance on delayed tests compared to blocked practice, despite feeling harder during the session.

Why does interleaving feel harder than blocked practice?

Interleaving requires retrieving the correct strategy for each new problem type rather than applying the same strategy repeatedly. This additional difficulty — called a desirable difficulty by Robert Bjork — forces deeper processing and builds discriminative ability. The feeling of struggling is the learning signal, not evidence that the approach is ineffective.

How do I start using interleaving?

Start with 2–3 related subjects you already have some familiarity with. Use the Interleaved Scheduler to generate a rotation. Spend 15–25 minutes per subject block before switching. Give yourself 3–5 sessions to adjust — the initial discomfort of interleaving reduces significantly once the brain adapts to switching modes.

Which subjects benefit most from interleaving?

Interleaving works best for subjects that require discriminative retrieval — maths problem types, science topics with shared concepts, language vocabulary. Sequential subjects with strict prerequisite knowledge should be covered in order first, then interleaved once the prerequisites are solid. Completely unrelated subjects can also be interleaved effectively.