Error archaeology

Examine every mistake to identify which chunk misfired, was missing, or had a faulty boundary.

Why it works

Errors in expert domains almost always trace to a specific chunking failure: a pattern was missed entirely, misclassified, or its boundaries were drawn too broadly so it was triggered in a context where it does not apply. Diagnosing which failure occurred points precisely to what needs to be rebuilt — unlike generic review, which can rehearse what is already known.

How to do it

1. After any significant error, ask: "Did I not recognize a pattern, recognize the wrong one, or misapply one I recognized correctly?"
2. Locate the specific chunk involved and review the examples that define its boundaries.
3. Find at least one foil case — a situation where the chunk does NOT apply — and study it alongside the canonical case.
4. Log the error type; recurring error types reveal systematic gaps in your chunk library.

Evidence

Error analysis is central to deliberate practice theory (Ericsson): targeted work on weaknesses, not comfortable repetition of strengths, drives expertise growth. Chunk-level error diagnosis makes the targeting precise. (mechanistic)

Deliberate practice research is correlational in elite performers; the chunk-diagnosis framing is a practitioner extension not independently tested as a protocol.

Sources

• Ericsson, Krampe & Tesch-Römer (1993), "The role of deliberate practice," Psychological Review

Common mistake

Reviewing errors at the domain level ("I need to study chess endings more") rather than the chunk level ("I keep misclassifying rook-and-pawn endgames as pawn-only endgames"), which generates unfocused review.