Shift from blocked overlearning to interleaved maintenance

After overlearning a skill in isolation, embed it in mixed practice to transfer it to real use.

Why it works

Blocked practice (drilling one skill in isolation) is efficient for initial acquisition and overlearning. But real performance requires discriminating when to apply a skill, not just executing it. Once overlearning has automatized the skill itself, interleaved practice — mixing it with other skills — trains the selection and transfer mechanism that blocked practice never built.

How to do it

1. After reaching your overlearning target on a skill in isolation, stop blocking.
2. Add the skill to a rotation with two or three related skills you have previously learned.
3. Do not tell yourself which skill each problem requires — practice making the selection, not just the execution.
4. Expect performance to drop initially; that drop is the interleaving effect working, not the skill eroding.

Evidence

Interleaving research consistently shows that mixed practice produces superior long-term retention and transfer compared to blocked practice, even though blocked practice feels more productive in the moment — complementing overlearning’s role in initial acquisition. (rct)

Blocked overlearning and interleaved maintenance are complementary, not competing; the sequencing matters — block first, then interleave.

Sources

• Rohrer & Taylor (2007), shuffling is beneficial for learning, Instructional Science

Common mistake

Continuing to drill in isolation long after the skill is automatized, never building the contextual judgment to know when and how to deploy it.