©Net Objectives, 2002
NetObjectives
5
“Official” Definitions of Use Case
nEach use case specifies a sequence of actions, including variants, that the entity can perform, interacting with actors of the entity
nEach use case specifies a service the entity provides to
its users, i.e. a specific way of
using the entity
nA use case is a coherent unit of functionality provided
by a system, a subsystem,
or a class as manifested by sequences
of messages exchanged among the system and one or more outside interactors (called actors) together with actions performed by the system.
üA description of a set of sequences of actions,
including variants, that a system
performs yielding an observable result
of value to an actor.