What does it mean that schema evolution log?

Keep a record of how your major schemas have changed over time. Without a written log, you cannot distinguish genuine intellectual growth from retroactive rationalization. The evolution log is the infrastructure that makes belief revision visible, traceable, and honest.

Example: A product manager believes for three years that "users want more features." After a failed launch, she shifts to "users want fewer, better features." Without a log, she rewrites her past: "I always knew simplicity mattered." With one, she can trace the exact meeting, the exact user research session, and the exact data that forced the revision. She can see what she believed before, why she believed it, what changed, and what evidence drove the change. The log does not just record the new belief. It preserves the old one — and the distance between them is where learning actually lives.

Try this: Start a schema evolution log today. Choose three beliefs that have significantly changed in the last five years — about your career, a relationship, a skill, a domain you care about, or yourself. For each, write a log entry using this structure: (1) The belief as you held it before the change — in its original language, not your current interpretation of it. (2) The approximate date or period when the change began. (3) The specific evidence, experience, or encounter that initiated the revision. (4) The belief as you hold it now. (5) What you lost by changing — what the old belief was protecting or enabling. Then examine the three entries together. What patterns do you see in how you revise beliefs? Do your revisions tend to be forced by crisis, or do you initiate them proactively? Do you revise quickly or resist for long periods before updating? These meta-patterns are the beginning of knowing yourself as a thinker.