Review:Modeling Convention for Subsystems and Interfaces <<subsystem>> CourseCatalogSystem ICourseCatalog System <<subsystem>>package <<subsystem proxy>>class Interfaces start with an "I" <<subsystem>> CourseCatalogSystem <<subsystem proxy>> ICourseCatalogSystem Interfaces are EXTERNAL to the subsystem. Object Oriented Analysis and Design 6Object Oriented Analysis and Design 6 Review: Modeling Convention for Subsystems and Interfaces CourseCatalogSystem <<subsystem>> ICourseCatalogSystem ICourseCatalogSystem <<subsystem proxy>> CourseCatalogSystem Interfaces start with an “I” <<subsystem>> <<subsystem>> package <<subsystem proxy>> class Interfaces are EXTERNAL to the subsystem