Requirements Artifact Set >
Use-Case Model... >
- Have you found all the actors? That is, have you accounted
for and modeled all roles in the system's environment? Although you
should check this, you cannot be sure until you have found and described
all the use cases.
- Is each actor involved with at least one use case? Remove any
actors not mentioned in the use-case descriptions, or any actors without
communicates-associations with a use case. However, an actor mentioned in
a use-case description is likely to have a communicates-association with
that particular use case.
- Can you name at least two people who would be able to perform
as a particular actor? If not, check if the role the actor models is part
of another one. If so, you should merge the actor with another actor.
- Do any actors play similar roles in relation to the system?
If so, you should merge them into a single actor. The
communicates-associations and use-case descriptions show how the actors
and the system interrelate.
- Do two actors play the same role in relation to a use case?
If so, you should use actor-generalizations to model their shared
- Will a particular actor use the system in several (completely
different) ways or does he have several (completely different) purposes
for using the use case? If so, you should probably have more than one
- Do the actors have intuitive and descriptive names? Can both
users and customers understand the names? It is important that actor names
correspond to their roles. If not, change them.
© 1987 - 2001 Rational Software Corporation