What is adaptive systems?

Adaptive systems is a concept in personal epistemology: The best category systems adapt as you learn more about what you are organizing.

Example: The Diagnostic and Statistical Manual of Mental Disorders has been reclassified through eight editions since 1952. DSM-I contained 106 diagnostic categories. DSM-II expanded to 182. DSM-III restructured the entire framework around empirical criteria and jumped to 265 categories. DSM-5 added six new classes, removed four, and reclassified numerous disorders — most notably absorbing Asperger's disorder into the broader autism spectrum disorder category. Each revision didn't mean the previous edition was wrong in some absolute sense. It meant psychiatry's understanding of mental illness had evolved, and the classification system needed to evolve with it. The manual's authors didn't treat their categories as permanent truths. They treated them as the best available approximation — to be refined as new evidence, new clinical experience, and new neuroscience arrived.

This concept is part of Phase 12 (Classification and Typing) in the How to Think curriculum, which builds the epistemic infrastructure for classification and typing.