States and events Flashcards
3
1
Q
Events definition
A
Something that happens in the environment.
2
Q
Event causes
A
- Events cause entities to change state.
- Need a response from the system
- Need to be recorded by the system
- Both
3
Q
States definition
A
A recognisable period in the life of an object.
4
Q
Different states
A
– Different capabilities
– Different constraints
– Different characteristics
The object will stay in a state until it is triggered by an event to change state.
5
Q
Activity definition
A
An activity is an ongoing process of performing some action.
6
Q
Uses of activity diagram
A
- Sequencing of a Business Use Case
- Business Work Flows & Responsibilities
- Sequencing of System Use Cases
- Sequencing of UI dialogue elements or screens within a System Use Case
- Data Flows within the System
