Behavioral Modeling
ISTM 201
Courtesy to
Dr.Dasgupta
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Key Ideas
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Behavioral models describe the internal dynamic
aspects of an information system that supports
business processes in an organization
Key UML behavioral models are: sequence
diagrams, collaboration diagrams, and statechart
diagrams
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Objectives
■ Understand the rules and style guidelines for sequence and
communication diagrams and behavioral state machines.
■ Understand the processes used to create sequence and
communication diagrams and behavioral state machines.
■ Be able to create sequence and communication diagrams and
behavioral state machines.
■ Understand the relationship between the behavioral models
and the structural and functional models.
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Purpose of Behavioral Models
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Show how objects colaborate to support each
use case in the structural model
Depict the internal view of the business
process
To show the effects of varied processes on
the system
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SEQUENCE DIAGRAM
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Sequence Diagram Concepts
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Illustrates the classes that participate in a use case
Shows the messages that pass between classes over time for
one use case
Can be a generic sequence diagram, but more frequently one is
drawn for a single scenario within the use case
Design diagrams are implementation specific -- database objects
or specific GUI components serve as classes
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Sequence Diagram
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Steps in Creating a Sequence
Diagram
1. Identify classes
2. Add messages
3. Place lifeline and focus of control
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Syntax for Sequence Diagram
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Steps of the Customer Places
Order Scenario
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Use Diagram for CD Selections
Internet Sales System
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Sequence Diagram for Customer Places
Order Scenario
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COLLABORATION
DIAGRAM
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Collaboration Diagrams
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Essentially an object diagram that shows message
passing relationships instead of aggregation or
generalization associations.
Emphasize the flow of messages among objects,
rather than timing and ordering of messages
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Syntax for Collaboration Diagrams
Actor
Object
Association
Message
Frame
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Example Collaboration Diagram
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Example: CD Selection
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Collaboration Diagrams
1. Set the context.
2. Identify which objects (actors) and the associations
between the objects participate in the collaboration.
3. Layout the communication diagram.
4. Add messages.
5. Validate the communication diagram.
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Building a Collaboration
Diagram
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Determine the context of the collaboration
diagram
Identify the participating objects and their
associations
Layout objects and associations
Add messages
Validate the sequence diagram
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STATECHART
DIAGRAM
(also called Behavioral
State Machine)
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Statechart Concepts
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A dynamic model showing changes of state
of a single class over time in response to
events along with its responses and actions
Typically not used for all classes, but just to
help simplify the design of algorithms for
methods of complex classes
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Syntax for Statechart Diagram
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Statechart Diagram for a
Hospital Patient
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Steps for Creating a Statechart
Diagram
1. Identify the states
2. Identify the transitions
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The Life of an Order
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Statechart Diagram for an
Order
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