DEV475 Mastering Object-Oriented Analysis and Design with UML ...

DEV475 Mastering Object-Oriented Analysis and Design with UMLUse-Case SpecificationsUse-Case Specifications• Name• Brief description• Flow of Events• Relationships• Activity diagrams• Use-Case diagrams• Specialrequirements• Pre-conditions• Post-conditions• Other diagramsUse-Case ModelActorsUse Cases...Use-Case SpecificationsMastering Object Oriented Analysis and Design with UMLCopyright © 2003 Rational Software, all rights reserved 14The use case has a set of properties as shown in the graphic. The use-case propertiesmay be documented in use-case specifications, which can include the items listedbelow:• Brief description describes the role and purpose of the use case.• Flow of events are textual descriptions of what the system does with regard tothe use case. There can be multiple flows of events — for example, a basic flowand alternative flows.• Relationships are communicates-associations. The use case includes and extendsrelationships that the use case participates in.• Activity diagrams can be used to illustrate the structure of the flow of events.• Use-case diagrams can be used to show the relationships involving the use case.• Special requirements is a textual description that collects all use-caserequirements, like nonfunctional requirements, that are not considered in theUse-Case Model, yet need to be taken care of during design or implementation.• Pre-conditions define a constraint on the system regarding when the use casemay start.• Post-conditions define a constraint on the system that applies after the use casehas terminated.• Other diagrams can be used to illustrate the use case, like hand-drawn sketchesor screen captures from an user-interface prototype.3 - 14