Log schema changes with 4 fields: date, original wording, triggering evidence, replacement belief
Write schema evolution log entries with four mandatory fields - date, schema affected in original language not current interpretation, specific triggering evidence or encounter, and the replacement belief - to defeat hindsight bias through fixed external records.
Why This Is a Rule
Schema evolution logs defeat hindsight bias by fixing the record at the moment of change. Without a log, your memory of "what I used to believe" shifts to accommodate current knowledge — six months later, you "always kind of knew" the new belief was right. The log preserves the actual old belief in its original language, making the evolution visible and honest.
The four mandatory fields capture what hindsight would erase: Date (when — anchors the change in time), Schema in original language (not your current interpretation of the old belief, but what you actually believed, in the words you would have used then), Triggering evidence (the specific encounter or evidence that caused the revision — not the general topic but the exact moment), Replacement belief (what you believe now — completing the before/after pair).
"In original language" is the critical constraint. Hindsight rewrites old beliefs to sound closer to current beliefs: "I used to think X, kind of" becomes "I sort of always suspected Y." Writing the old belief in its original language — the way you would have stated it before the change — preserves the actual distance traveled.
When This Fires
- When any schema revises — a belief changes, a model updates, an assumption fails
- During the belief update process (Write belief updates as 'Based on [evidence], I am updating from [old] to [new]' — revision is calibration) as the documentation step
- When you want to track your epistemic evolution over time
- During any deliberate practice of calibration and self-knowledge
Common Failure Mode
Writing the old belief in current language: "I used to overweight velocity metrics." But at the time, you called them "our most important planning tool" — the old language reveals how invested you were, which the current-language version glosses over.
The Protocol
When a schema changes: (1) Date: today's date. (2) Schema in original language: write the old belief as you would have stated it before today. Not "I used to kind of think X" but "I believed [specific statement as I would have said it]." (3) Triggering evidence: the specific event, data, conversation, or experience that caused the change. (4) Replacement: what you believe now. These four fields take 2-3 minutes and produce a permanent record that hindsight cannot rewrite.