1. State Transition Diagram for A System
8/24/2018
Discrete Structure 1

2. State Transition Diagram
State transition diagram introduction
Draw transition diagram and use case diagram for the system
List questions
8/24/2018
Discrete Structure 2

3. Elements in a State Transition Diagram
a mode of behavior
last for a period
Event
Causes the transition from a state to another state
Action
The behavior that the system reacts to an event
Condition
A condition for an action to an event
Whether a behavior is a state or an event or an action depends on the real systems.
2018/8/24
Software Engineering 3

4. State, Event, Action, Condition
Event[Condition]/Action
State 2

5. Event, Action User System Operate on the system (Event)
Respond to the user’s operation (Action)
When the response is given under certain conditions, the conditions should be added.

6. An Example - Login Teacher & TA main function page Login Page
“Login” clicked [correct login & Teacher & TA]
/Display Secretary main function page
“Login” clicked [incorrect password & user name]
/give warning
Login Page
“Login” clicked [correct login & TA]
/Display Secretary main function page
“Login” clicked [correct login & secretary]
/Display Secretary main function page
“Login” clicked [correct login & teacher ]
/Display Secretary main function page
Secretary main function
page
TA main function page
Teacher main function page

7. An Example - Mark Time Table
Teacher & TA main function
page
“Mark time table” pressed /Display time table
Time table page
Secretary main function page
“Finished” pressed/Display time table