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Reference card: Derive state model.
Incoming and outgoing data
System structures:
Description of the static structures of the
system.
Use cases:
Services provided by the system.
System structures [with state machine]:
Blocks with state machine.
Motivation/description
Why? The behavior of a system is often determined by the states of its blocks.
What? Model the state machines for all relevant blocks.
How? Describe the state machines in a state machine diagram, based on
interactions between blocks and use case fl ows.
Where? The state machines are executable and can be used for simulating the
system.
Guiding questions
?–  Have all paths of the system fl ows been considered in the state machines?
?–  Have different aspects been modeled in separate regions?
SysML elements
State machine diagram, state machine, state, transition, pseudostates (e.g., start
state, history pseudostate).
Derive state
model
System structures
System structures
[with state machines]
Use cases
127 2.7 Realizing Use Cases
the state machine in some form or another.


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