Artifacts Involved in Design Phase
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by Uday Denduluri
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Sequence Diagrams

Sequence diagrams are one of the most popular UML diagrams explaining the dynamic behavior of the software. A Sequence diagram explains the object life cycle from its creation to its termination with respect to other objects. The two important parts of a sequence diagram are lifeline and messages. A lifeline shows the scope of the object. It represents the lifeline of the object showing the scope of the object from creation to termination. A message generally represents a method of an object or an operation of the object. In sequence diagrams we can even show the self methods of an object. Figure 1 shows an object "SomeObject" with a message "Some Message." The vertical rectangle shown defines the scope of the object. It should be noted that the scope of the object shown is always relative to another object.

Figure 1

Let us take a meaningful example to understand a sequence diagram. Let us explain a simple log-in page authentication. For simplicity, let us omit the database provider and limit our self with the authentication provider. Figure 2 shows the object LogIn.aspx page with user name and password given by the user and clicks on the button Log-In. After this the Authenticate Credentials method gets called for the object AuthenticationProvider.

Figure 2

 


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User Comments

Title: Mr.   
Name: PeterB
Date: 2007-06-12 10:39:37 AM
Comment:
If Integrated Design Document deal with a module and it's interaction with other modules within the project or system,

Which document will provide the complete
Resources:


http://envstudies.brown.edu/thesis/2004/Molly_Macgregor/How_When/Integrated_Design.htm

Many More

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