ICT103 - A UML Model Used To Graphically Show Uses Cases - IT/Computer Science Assignment Help

Assignment Task

1. Use Cases:

• Use case— an activity that the system performs, usually in response to a request by a user. Use cases define functional requirements.

• Use case diagram— a UML model used to graphically show uses cases and their relationships to actors.

Use Case Diagrams Symbols

Use Case Example

2. Activity Diagram:
Activity Diagram– describes user (or system) activities, the person who does each activity, and thesequential flow of these activities
a. Useful for showing a graphical model of a workflow
b. A UML diagram
Activity Diagram Symbols

Activity Diagram Example

3. Sequence Diagrams:
• A UML sequence diagram
• Special case for a sequence diagram
• Only shows actor and one object
• The one object represents the complete system
• Shows input & output messaging requirements for a use case
• Actor, System, object lifeline
• Messages
System Sequence Diagram (SSD) Notation

4. Domain Model Class Diagram:
• Class
• A type of classification used to describe a collection of objects
• Domain Class
• Classes that describe objects in the problem domain
• Class Diagram
• A UML diagram that shows classes with attributes and associations (plus methods if it models software classes)
• Domain Model Class Diagram
• A class diagram that only includes classes from the problem domain, not software classes so no methods
Domain Model Class Diagram Notation

5. State Machine Diagram:
• State Machine Diagram – a diagram which shows the life of an object in states and transitions
• Origin state – the original state of an object before it begins a transition
• Destination state – the state to which an object moves after completing a transition
• pseudostate – the starting point in a state machine diagram. Noted by a black circle.
• action-expression – some activity that must be completed as part of a transition
• guard-condition – a true/false test to see whether a transition can fire

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