How do I practice cost of error correction?

The most direct way to practice cost of error correction is through a focused exercise: Pick one recurring correction you perform regularly — proofreading a document, double-checking a calculation, reviewing a process for mistakes. Time yourself doing it today. Write down three numbers: (1) how many minutes the correction took, (2) how many actual errors you found, and (3) what the cost per error caught was (time divided by errors). Then ask: what single upstream change — a template, a checklist, an automation, a constraint — could prevent half of those errors from occurring? Implement that change. Repeat the measurement in one week and compare. You are not trying to correct faster. You are trying to make correction unnecessary.

Common pitfall: Treating error correction as free — something you 'just do' without accounting for the time, attention, and opportunity cost it consumes. This blindness creates a perverse incentive: the more errors your system produces, the more heroic your corrections feel, and the less motivation you have to fix the system that generates the errors. You become addicted to firefighting. The person who spends four hours a day fixing things that should not have broken in the first place feels productive. They are not. They are paying a tax that a better-designed system would eliminate.

This practice connects to Phase 25 (Error Correction) — building it as a repeatable habit compounds over time.