ME.15:10 - Rationale

Reuse depends on knowing what way of doing is being reused. Files and tools can carry or support that way, and Work can reveal changes, but only reusable semantic change distinguishes a Method variant for the maintained use. Derivation does not supply the child’s Method admission; that admission is checked independently.

Maintaining applicability, evidence, currentness, and retirement with the variant prevents a static family tree. The result is a repertoire for decisions rather than a genealogy or archive alone.