What is schema integration over time?

Schema integration over time is a concept in personal epistemology: Connect what you know now with what you knew before — your past schemas contain wisdom.

Example: At 25 you believed 'move fast and break things' was the only way to build products. At 35, after cleaning up the wreckage of three teams burned out by that philosophy, you believed 'move deliberately and build sustainably.' Both schemas were rational responses to their contexts. The 25-year-old was right that speed creates learning opportunities. The 35-year-old was right that speed without recovery destroys capacity. Integrating across time means holding both versions in view simultaneously — not choosing one, but extracting the valid kernel from each and composing them into a schema that neither version could have produced alone: 'move fast on what is reversible, move deliberately on what is not.'

This concept is part of Phase 20 (Schema Integration) in the How to Think curriculum, which builds the epistemic infrastructure for schema integration.