1. UML Modeling Sequence diagram
University of Centeral Punjab Fsd Campus
UML Modeling Sequence diagram

2. Requirements Modeling Strategies
Flow-Oriented Modeling
Data Flow Diagram
Control Flow Modeling
State/Activity Diagram
Behavior Modeling
Sequence Diagram

3. Sequence Diagram
Sequence Diagram: an "interaction diagram" that models a single scenario executing in the system
perhaps 2nd most used UML diagram (behind class diagram)
University of Centeral Punjab Fsd Campus

4. Sequence Diagram definition
A sequence diagram is an interaction diagram that emphasizes the time ordering of messages. It shows a set of objects and the messages sent and received by those objects.
Graphically, a sequence diagram is a table that shows objects arranged along the X axis and messages, ordered in increasing time, along the Y axis.

5. Sequence Diagram
Participant: an object or entity that acts in the sequence diagram
sequence diagram starts with an unattached "found message" arrow
Message: communication between participant objects
The axes in a sequence diagram:
horizontal: which object/participant is acting
vertical: time (down -> forward in time)
University of Centeral Punjab Fsd Campus

6. Importance of Sequence Diagrams
Depict object interactions in a given scenario identified for a given Use Case
Specify the messages passed between objects using horizontal arrows including messages to/from external actors
Time increases from Top to bottom
University of Centeral Punjab Fsd Campus

7. Rules of Sequence Diagrams
Sequence Initiation

8. Sequence Diagram An object in a sequence diagram is rendered
an Order Line
An object in a sequence diagram is rendered
as a box with a dashed line descending from it.
The line is called the object lifeline, and it
represents the existence of an object over a
period of time.
Software Design (UML)

9. Messages between objects
message (method call) indicated by horizontal arrow to other object
write message name and arguments above arrow

10. Sequence Diagram Messages are rendered as horizontal
an Order Line
a Stock Item
Messages are rendered as horizontal
arrows being passed from object to
object as time advances down the
object lifelines. Conditions ( such as
[check = “true”] ) indicate when a
message gets passed.
check()
[check = “true”] remove()
Software Design (UML)

11. Sequence Diagram
an Order
a Order Line
* prepare()
An iteration marker, such as * (as shown), or *[i = 1..n] , indicates that a message will be repeated as indicated.
Iteration
marker
Software Design (UML)

12. Rules of Sequence Diagrams
Identify objects needed to support use case, determine sequence of internal events following the external initiating event
Diagrams that are not initiated with an external actor represent only a partial sequence
Partial sequence diagrams should clearly identify the actor initiated sequence diagrams from which they are launched

13. System Sequence Diagram for Deposit Money Use Case

14. Sequence dg. from use case
University of Centeral Punjab Fsd Campus

15. Sequence Diagram for ATM Sample

16. Example

17. Example

18. Example

19. Draw Complete withdraw of money diagram !!

20. Sequence Diagram(make a phone call) ???

21. Sequence Diagram(make a phone call)
Caller
Phone
Recipient
Picks up
Dial tone
Dial
Ring notification
Ring
Picks up
Hello

22. Task!!
Draw Sequence Diagram for Seat Reservation

23. Example

24. Modeling for WebApps
Content Analysis. The full spectrum of content to be provided by the WebApp is identified, including text, graphics and images, video, and audio data. Data modeling can be used to identify and describe each of the data objects.
Interaction Analysis. The manner in which the user interacts with the WebApp is described in detail. Use-cases can be developed to provide detailed descriptions of this interaction.

25. Modeling for WebApps
Functional Analysis. The usage scenarios (use-cases) created as part of interaction analysis define the operations that will be applied to WebApp content and imply other processing functions. All operations and functions are described in detail.
Configuration Analysis. The environment and infrastructure in which the WebApp resides are described in detail.

26. When Do We Perform Analysis?
In some Web situations, analysis and design merge. However, an explicit analysis activity occurs when …
the WebApp to be built is large and/or complex
the number of stakeholders is large
the number of Web engineers and other contributors is large
the goals and objectives (determined during formulation) for the WebApp will effect the business’ bottom line
the success of the WebApp will have a strong bearing on the success of the business