Objects Interact with Messages A message shows how one object asks another object to perform an operation. Message getCourseOfferings(forSemester) RegistrationController :CourseCatalogSystem Object Oriented Analysis and Design 9Object Oriented Analysis and Design 9 Objects Interact with Messages  A message shows how one object asks another object to perform an operation. : Car buyer Message :RegistrationController :CourseCatalogSystem getCourseOfferings(forSemester)