Interleaved pattern practice

Mix multiple pattern types in a single session to sharpen discrimination between chunks.

Why it works

Blocked practice (all examples of type A, then all of type B) feels easier but produces shallower encoding because the learner merely repeats the same procedure. Interleaving forces discrimination — the learner must identify which chunk applies before applying it — which strengthens the boundaries between patterns and reduces confusion at retrieval.

How to do it

1. Gather examples from at least three different patterns you are currently building.
2. Shuffle them randomly and work through without knowing in advance which type you will see.
3. Before each example, name the pattern; after, confirm whether you were right.
4. Expect performance to feel harder than blocked practice — that difficulty is the learning.

Evidence

Interleaving reliably outperforms blocked practice on delayed tests across mathematics, motor skills, and category learning, with effects attributed to comparison and discrimination processes that blocked practice suppresses. (rct)

Interleaving degrades immediate performance relative to blocked practice, so it can feel like it’s working worse when it’s working better; the test must be delayed to see the advantage.

Sources

• Kornell & Bjork (2008), "Learning concepts and categories," Psychological Science
• Rohrer & Taylor (2007), interleaving in mathematics, Applied Cognitive Psychology

Common mistake

Abandoning interleaving because it feels harder and returning to blocked practice, which is more comfortable but less effective for building discriminating chunks.