How do I practice types of errors?

The most direct way to practice types of errors is through a focused exercise: Pick three errors you have made in the past month — professional or personal. For each one, classify it: Was it an execution error (you knew what to do but failed in the doing)? A knowledge error (you lacked critical information)? A judgment error (you had the information but assessed it incorrectly)? Write one sentence naming the error, one sentence classifying its type, and one sentence describing what the correct fix would be for that type. Notice whether your instinctive response to all three was the same ('try harder,' 'be more careful') versus the type-specific correction each actually requires. This exercise should take ten minutes.

Common pitfall: Collapsing all errors into a single category — usually effort. When something goes wrong, the default human response is 'I should have tried harder' or 'I need to be more careful.' This treats every error as an execution problem and leaves knowledge gaps and judgment failures completely unaddressed. A programmer who responds to every bug by 'being more careful' will never fix the logic errors caused by a misunderstanding of the requirements, or the design errors caused by choosing the wrong architecture. Misdiagnosis of error type is itself a meta-error that prevents learning.

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