secondary actors(См. Software Modeling and Design by Hassan Gomaa, а тж. Designing Concurrent, Distributed, and Real-time Applications with UML (Object Technology Series) by Hassan Gomaa ssn)
primary and secondary actors(См. Software Modeling and Design by Hassan Gomaa, а тж. Designing Concurrent, Distributed, and Real-time Applications with UML (Object Technology Series) by Hassan Gomaa ssn)