how to use case diagrams
DESCRIPTION
What are Case Diagrams ? How to use Case Diagrams ? Where to Use Case Diagrams ?TRANSCRIPT
Use Case DiagramsUse Case Diagrams
Use Case
A use case is actually a list of steps, usually determining relationships in between a role (known in UML as an “actor") and a system, to achieve a goal. The actor can be a human or even a good external system.
Use Case Diagrams
Use case diagrams model the actual performance associated with system utilizing actors as well as use cases.
A use case diagram from it's easiest is really a graphical representation of a user's interaction using the system as well as depicting the specifications of a use case. A use case diagram can portray the various kinds of users of a system and also the other ways they connect to the actual system.
Cont…
Use case diagram
Description:diagram which provides an overview associated with system functionality. Shows which use cases the individual actor uses
Purpose:In order to analyse the functionality the system should consist of :
Construction elements:
Package
Use case
Package name
No. and use case name
To provide a summary from the performance as well as how it is linked In order to evaluate the way theactors should use the system
Challenges:•To simplify the complex
«extends»
<<include>>
Communication arrow
Use case diagram
Actor:Person (or even system), that uses the system (think in terms of roles)
Purpose:•In order to analyse that actors may use the actual system•In order to evaluate the way the use of the actors is linked
Construction elements:
Actor
Specialisation /Generalisation
Aktør
Challenges:
It is NOT an organisational chart (no organisational linkages required)
Symbols And Notations
System :Draw your system's boundaries using a rectangle which has use cases. Place actors away from system's boundaries.
UseCase :Draw use cases using ovals. Label along with ovals with verbs which signify the actual system's functions.
Use case diagram
Actors :Actors would be the users of a system. Whenever one system may be the actor associated with an additional system, label the actor system using the actor stereotype.
Relationships :Demonstrate relationships in between an actor along with a use case with a simple line.
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