How To and Where To Use Case Diagrams

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Use Case Diagrams
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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.
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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.
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Cont
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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
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• 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

Communication arrow
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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

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• Challenges
• It is NOT an organisational chart (no
  organisational linkages required)

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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.
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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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