Subsystem Responsibilities ◆ Subsystem responsibilities defined by interface operations Model interface realizations O Interface operations may be realized by Internal class operations Internal subsystem operations <<interface>> ICourseCatalogSystem <<subsystem>> CourseCatalogSystem getCourseOfferings() subsystem responsibility Object Oriented Analysis and Design 9Object Oriented Analysis and Design 9  Subsystem responsibilities defined by interface operations ▪ Model interface realizations  Interface operations may be realized by ▪ Internal class operations ▪ Internal subsystem operations CourseCatalogSystem ICourseCatalogSystem <<subsystem>> getCourseOfferings() <<interface>> subsystem responsibility Subsystem Responsibilities