1. www.company.com Lab 6 CPIT 250 System Analysis and Design

2. www.company.com Outline System Development Life Cycle System Design Phase –Again, what is UML ? –UML Sequence Diagram CPIT 250 System Analysis and Design

3. www.company.com System Analysis and Design Different phases of system development life cycle: CPIT 250 System Analysis and Design

4. www.company.com What is UML ? The Unified Modeling Language (UML) is a visual modeling language that enables system builders and developers to create blueprints that describe their visions in a standard, easy-to understand way, and provides a mechanism to effectively share and Communicate these visions with others. CPIT 250 System Analysis and Design

5. www.company.com UML Diagrams UML includes the following nine diagrams –Class diagram –Object diagram –Deployment diagram –Component diagram –Activity diagram –Use case diagram –Collaboration diagram –Sequence diagram –Package diagram CPIT 250 System Analysis and Design Structural Modeling Behavioral Modeling Architectural Modeling

6. www.company.com Sequence Diagram Definition: –A sequence diagram is a graphical view of a scenario that shows object interaction and communication in a time based sequence, what happens first and what happens next. –A sequence diagram has two dimensions: vertical placement that represents time and order of events horizontal placement that represents different objects. CPIT 250 System Analysis and Design

7. www.company.com Sequence Diagram Notations: CPIT 250 System Analysis and Design 1 2 3

8. www.company.com Sequence Diagram Notations: 1- Boxes represent the objects of the system 2- Arrows represent messages between objects. –An object can send a message to itself. –An object can return message to sender object which is shown as dashed line. 3- lifelines represent the existence of an object at a particular time. –Its length indicate an object's creation or destruction. CPIT 250 System Analysis and Design

9. www.company.com Sequence Diagram Example ( Railway Reservation System ) CPIT 250 System Analysis and Design