MMP.17:10 - Architectural Rationale

The response and the receiver’s operation are chosen before the representation because they determine which differences matter. Reconstructing an entire model can waste effort; reproducing only a convenient summary can remove what the next operation needs. Selecting (Q) and (D) makes that trade-off actionable.

MMP.11 constructs families from known relations. MMP.17 adds the substitution question: which source responses to retain, which cases make their replacement informative, and where to refine or return when the replacement changes a receiving answer. CMP.7 and CMP.6 supply learning and computation when those are the chosen construction, while CMP.8 supplies numerical approximation control. The interpolation branch shows why a surrogate need not require a learner.

The source remains distinguishable from its replacement because a source call can repair approximation without repairing the model’s account of the world. MMP.14 governs the latter discrepancy. Likewise, fast predictive use can coexist with a separate explanatory model; neither role earns the other’s conclusions by sharing outputs.