 The name of each subsystem is unique and descriptive of the collective responsibilities of the subsystem  The subsystem description accurately reflects the collective responsibilities of the subsystem  The subsystem, through its interfaces, presents a single, logically consistent set of services  The subsystem is the responsibility of a single individual or team  The subsystem realizes at least one interface  The interfaces realized by the subsystem are clearly identified and the dependencies are correctly documented  The subsystem's dependencies on other model elements is restricted to interfaces and packages to which the subsystem has a compilation dependency  The information needed to effectively use the subsystem is documented in the subsystem facade  Other than the interfaces realized by the subsystem, the subsystem's contents are completely encapsulated  Each operation on an interface realized by the subsystem is utilized in some collaboration  Each operation on an interface realized by the subsystem is realized by a model element (or a collaboration of model elements) within the subsystem  Subsystem partitioning done in a logically consistent way across the entire model  The contents of the subsystem are fully encapsulated behind its interfaces |