Status: IN
The GoF's practitioner system achieves both compositional monism (dual behavioral infrastructure unified at the substrate level by composition, with causal necessity established by runtime/compile-time divergence) and convergent validation (bottom-up progressive evidence converging with top-down subsystem analysis) — the system practitioners use is the same system whose substrate is provably composition-necessary, making the practitioner's default to composition not merely heuristic but structurally entailed.
Convergent validation confirms the same system whose substrate is proven compositionally monistic
Depends on (SL): composition-monism-causally-and-empirically-complete, design-knowledge-convergently-validated-top-down-and-bottom-up