The document discusses use case diagrams and their components. It defines use cases, actors, and associations. It explains how to structure use cases using generalization, include, and extend relationships. The include relationship extracts common behaviors, while extend adds optional or conditional behaviors. Well-structured use case diagrams can form the basis for software requirements.
topic : UML DIAGRAMS
content : Use Case Diagram
Class Diagram
Interaction diagram
Activity diagram
Case Study
details :
Use Case Diagram ::
1 Dynamic in nature.
2 It is used to model the system/subsystem of the application.
3 Built in early stage of development and developed by analyst
4 Involves interaction between user and system.
Class Diagram ::
1 Class diagram is a static diagram.
2 Class diagram used for different aspects of a system.
3 The class diagram describe the attributes and operations of a class.
4 It is also known as structural diagram.
topic : UML DIAGRAMS
content : Use Case Diagram
Class Diagram
Interaction diagram
Activity diagram
Case Study
details :
Use Case Diagram ::
1 Dynamic in nature.
2 It is used to model the system/subsystem of the application.
3 Built in early stage of development and developed by analyst
4 Involves interaction between user and system.
Class Diagram ::
1 Class diagram is a static diagram.
2 Class diagram used for different aspects of a system.
3 The class diagram describe the attributes and operations of a class.
4 It is also known as structural diagram.
RequirementOne CEO Martin Gorm Pedersen talks about working with remote teams and how requirements management tools can help. For more information on project management software visit: http://www.requirementone.com/
RequirementOne CEO Martin Gorm Pedersen talks about working with remote teams and how requirements management tools can help. For more information on project management software visit: http://www.requirementone.com/
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38. The Generalization Relationship
• A child use-case can inherit the behaviors, ,
relationships and communication links of a
parent use-case (like Actor generalization)
• In other words, it is valid to put the child use
words use-
case at a place wherever a parent use-case
appears
• Th relationship b t
The l ti hi between th child use-case and
the hild d
the parent use-case is the generalization
relationship
• For example: suppose the ATM system can be
used to pay bills. Pay Bill has two child use cases:
Pay Credit Card Bill and Pay Utility Bill
38
41. Use-Case Scope
Use Case
• A use case must be initiated by an actor
• When a use case is considered complete,
there are no further inputs or outputs; the
desired functionality has been performed,
or an error has occurred
• After a use case has completed, the system
is in
i i a state where the use case can b
h h be
started again, or the system is in an error
state
41
42. Base Use-Case vs. Abstract Use-Case
Use Case Use Case
y y
• Base use case – invoked directly by actor
to achieve an observable goal
• Abstract use case – invoked by other use
cases and is not a complete goal f
di l l from
user’s perspective
• e g withdraw cash (concrete use case) vs
e.g. vs.
login (abstract use case)
42
45. Summary of Notations
Construct Description Notation
Use-case A sequence of transactions
performed by a system that produces
a measurable result for a particular
actor
Actor A coherent set of roles that users play
when interacting with these use cases
System The boundary between the physical
Boundary system and the actors who interact
with the physical system
45
46. Summary of Notations
Construct Description Notation
Association The participation of an actor in a
use case, i.e. an instance of an
actor and instances of a use case
communicating with each other
Generalization A taxonomic relationship between
a general use case and a more
l d
specific use case. The arrow head
points to the general use case
Extend
E t d A relationship b t
l ti hi between an
extension use case and a base use
case, specifying how the behavior
of the extension use case can be
inserted into the behavior defined
for the base use case. The arrow
head points to the base use case 46
47. Summary of Notations
Construct Description Notation
Include A relationship between a base use
case and an inclusion use case,
specifying how the behavior for the
inclusion use case is inserted into the
behavior defined for the base use
case. The arrow head points to the
inclusion use case
47