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system theoretic process analysis.md
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- 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 [[losses]], [[scope]], [[hazards]], [[constraints]] (optionally derived also from [[sub hazards]]).
- model the control structure
- 1. define the purpose of the analysis, including [[losses]], [[scope]], [[hazards]], [[constraints]] (optionally derived also from [[sub hazards]]).
- 2. 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
@@ -16,4 +16,7 @@
- find [[system level constraints]].
- they can look like [[hazards]], inverted.
- or define how the system must [[minimize losses]] in case the hazards occur.
- optionally find [[sub hazards]], which might also help define further constraints
- optionally find [[sub hazards]], which might also help define further constraints
- step two: model the control structure
- ![[Pasted image 20210718234132.png]]
- a control structure is a system model that is composed of feedb