Externalize mental models by writing them down as named,

Why This Is a Principle

This derives from Generative Externalization (externalization through writing is generative), Externalization Exposes Hidden Structure (externalizing thought exposes gaps), and Knowledge that exists only in tacit form degrades without (tacit knowledge degrades without detection). It prescribes the specific action of converting implicit mental models into explicit, written schemas that can be examined and improved. This is more specific than the axioms—it tells you HOW to make the implicit explicit through naming and versioning.