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Chapter 2

Good overall summary in the first page:

!Pasted image 20210718144905.png

I wonder what the formalism is in this diagram. It is not an STPA diagram in the "main" sense as it doesn't model control loops explicitly, but is it part of the STPA framework?

!Pasted image 20210718150828.png

First step: defining the purpose of the analysis.

!Pasted image 20210718150742.png

Losses:

!Pasted image 20210718150713.png

!Pasted image 20210718155038.png

Stakes are values:

!Pasted image 20210718151545.png

Definition of system:

!Pasted image 20210718162616.png

hazards + environmental conditions = losses

!Pasted image 20210718231941.png

The heart of STPA: the control loop.

!Pasted image 20210718234343.png

Refining control structures:

!Pasted image 20210719000525.png

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On control proper:

!Pasted image 20210719005502.png

tips to prevent common mistakes in a control structure:

!Pasted image 20210719010243.png

Step three:

!Pasted image 20210719010634.png

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