Review:Subsystems and Interfaces A Subsystem: ◆lsa“cross between”a package and a class Realizes one or more interfaces that define its behavior <<interface>> <<subsystem>> Interface Subsystem Name Realization(Canonical form) Interface Subsystem <<subsystem>> Subsystem Name Interface Realization (Elided form) Object Oriented Analysis and DesignObject Oriented Analysis and Design 4 A Subsystem:  Is a “cross between” a package and a class  Realizes one or more interfaces that define its behavior <<subsystem>> Subsystem Name Interface Subsystem <<subsystem>> Subsystem Name Interface Realization (Canonical form) Realization (Elided form) <<interface>> Interface Review: Subsystems and Interfaces