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Unit 1: Introduction to System Simulation
Notes
Figure 1.8: CASE toolset DFD
Did u know? What is DFD?
DFD is a chart that follows the movement of data in a computer system and displays how
the data is to be processed to characterize data.
State Machine Models
1. These model the behaviour of the system in response to external and internal events
2. They show the system’s responses to stimuli so are often used for modelling real-time
systems
3. State machine models show system states as nodes and events as arcs between these nodes.
When an event occurs, the system moves from one state to another
4. State charts are an integral part of the UML
Figure 1.9: Microwave Oven Model
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