Status: OUT
Composition operates at three distinct scales in OO design, each validated by the GoF catalog: at the object relationship level, abstract coupling provides substitutability and flexibility; at the data structure level, Composite and Flyweight combine for scalable recursive trees; and at the system architecture level, pattern composition assembles cooperating patterns into frameworks — demonstrating that composition is not just a local technique but a fractal organizing principle.
Three depth-2 conclusions each demonstrate composition dominance at a different granularity
Depends on (SL): abstract-coupling-composition-dual-foundation, composite-flyweight-scalable-trees, pattern-composition-scales-to-architecture