1. State Diagrams
Pepper

2. Purpose
Show behavior from the view of movement through different states.
See how you can get to a certain state
See how you can leave a certain state
See all the actions that can be done while in a state

3. 2 Lists : State and Stimulus
EX: A course in a registration system
State List Stimulus List
Stimulus
Description
Create course
Initializes the course
Register students
Happens inside the open state.
Cancel the course
Cancels an existing course but a record of the course existing remains. Tell students it cancels
Delete a course
Delete a mistakenly created course
Fill a course
Closes the course
Notify about cancelation
Happens inside the canceled state
State
Description
Initialized
Exists, but no details set up
Open
Ready for registration
Canceled
Closed
Deleted

4. Course State Diagram
Credit to :

5. Words on the Line: Trigger : an action Guard (inside []) : a condition
Transitional behavior (after /) : a message or variable setting

6. Summary Start with states
List of state and stimulus helps you think of all different states
Some actions may happen inside states and not be stimulus for movement
Draw rounded boxes for states
Look at each stimulus to see if it gets an arrow from that state.
Not an activity diagram