{"id":"abstract-coupling-composition-dual-foundation","text":"Abstract coupling and object composition form the dual foundation of GoF pattern flexibility: abstract coupling provides the substitutability mechanism (references to abstract types rather than concrete ones) while composition provides the assembly mechanism (delegating to composed objects at run-time) — and behavioral patterns systematically exploit both.","truth_value":"OUT","source":"","source_url":"","source_hash":"","justifications":[{"type":"SL","antecedents":["abstract-coupling-enables-pattern-flexibility","behavioral-patterns-favor-composition","composition-superiority-for-reuse"],"outlist":[],"label":"Three depth-1 conclusions converge on a single insight — abstract coupling and composition are complementary, not redundant"}],"dependents":["composition-centric-design-paradigm","composition-operates-at-three-scales"],"metadata":{"source_type":"derived","review_result":"unnecessary"},"created_at":"2026-06-17T17:55:06+00:00","updated_at":"2026-06-17T20:39:50+00:00","reviewed_at":"2026-06-17T20:39:50+00:00","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"abstract-coupling-composition-dual-foundation","truth_value":"OUT","reason":"SL justification invalid","failed_antecedents":["abstract-coupling-enables-pattern-flexibility"],"label":"Three depth-1 conclusions converge on a single insight — abstract coupling and composition are complementary, not redundant"}]}}