The following people use the services:

• Implementers, for an understanding of the roles the service plays and how the Service Specification is used by the service.
• Designers of other services in the understanding of the collaborations in which services participate.
• Use-case designers to represent them by example in use-case realizations.
• Those who design the next version of the system, to understand the functionality in the service model.
• Those who test the classes, to plan testing tasks.