Status: IN
ChangeManager concretely demonstrates multi-pattern composition across the Observer-Mediator tradeoff: it centralizes Observer's distributed notifications by acting as a Mediator between subjects and observers, resolving the distribution-centralization tradeoff for the specific case of multi-subject dependency tracking — validating that competing communication patterns can be composed rather than merely chosen between.
ChangeManager is a concrete case where the abstract Observer-Mediator tradeoff is resolved by composition rather than selection — depth-2 from base + depth-1
Depends on (SL): gof-changemanager-mediator-singleton, observer-mediator-distribution-centralization-tradeoff