Relationships: Categories And Properties

Properties Categories		Inheritance	Association	Aggregation	Composition	Dependency
Semantics (Meaning)	Is A	■
	Has A		■‡	■†	■†
	Depends On					■
Directionality (Navigation)	Unidirectional	■		■	■	■
Directionality (Navigation)	Bidirectional		■
Lifetime	Coincident	■			■
	Independent		■	■
	Different					■
Sharing	Exclusive	■			■
Sharing	Shareable		■	■		■

‡ Reads well in both directions - peer to peer.
† Reads well in only one direction - whole to part. Alternately read as "Is A Part Of" - from part to whole.

From property values to relationship categories.

Category Property	Semantics	Directionality	Lifetime	Sharing	Binding
Inheritance	is a is like a is a kind of	unidirectional	coincident	exclusive	strong
Composition	has a is a part of contains	unidirectional	coincident	exclusive	strong
Aggregation	has a is a part of contains	unidirectional	independent	shareable	weak
Association	has a is a part of contains	bidirectional	independent	shareable	weak
Dependency	depends on uses delegates to	unidirectional	temporary	shareable	transient brief short-lived

Summary of relationship property values.