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system theoretic process analysis.md
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- [[pull]] [[stpa handbook]] [[stpa workshop]]
- [[push]] [[stpa]]
- I love how STPA defers key steps to a later stage so they can be done systemically, once partial but complete initial modeling has taken place.
- can be applied recursively
- 4 [[steps]]
- define the purpose of the analysis, including [[scope]], [[losses]], [[hazards]], [[constraints]] (optionally derived also from [[sub hazards]]).
- define the purpose of the analysis, including [[losses]], [[scope]], [[hazards]], [[constraints]] (optionally derived also from [[sub hazards]]).
- model the control structure
- step one: define the purpose of the analysis
- start with the [[losses]], which involve something of value to stakeholders
- continue by defining the scope of the system
- continue by defining the [[scope]] of the system
- find [[hazards]], which are systemic states or conditions to be prevented, and which together with (worst-case) environmental conditions lead to [[losses]].
- [[hazards]] + [[environmental conditions]] -> [[losses]]
- find [[system level constraints]].
- they can look like [[hazards]], inverted.
- or define how the system must [[minimize losses]] in case the hazards occur.
- can be applied recursively
- find [[sub hazards]], which