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system theoretic process analysis.md
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@@ -8,7 +8,9 @@
- 4 [[steps]] - 4 [[steps]]
- 1. define the purpose of the analysis, including [[losses]], [[scope]], [[hazards]], [[constraints]] (optionally derived also from [[sub hazards]]). - 1. define the purpose of the analysis, including [[losses]], [[scope]], [[hazards]], [[constraints]] (optionally derived also from [[sub hazards]]).
- 2. model the control structure - 2. model the control structure
- step one: define the purpose of the analysis - 3. identify unsafe control actions
- 4. identify loss scenarios
- step one: [[define the purpose of the analysis]]
- start with the [[losses]], which involve something of value to stakeholders - 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]]. - find [[hazards]], which are systemic states or conditions to be prevented, and which together with (worst-case) environmental conditions lead to [[losses]].
@@ -17,7 +19,7 @@
- they can look like [[hazards]], inverted. - they can look like [[hazards]], inverted.
- or define how the system must [[minimize losses]] in case the hazards occur. - 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 - step two: [[model the control structure]]
- ![[Pasted image 20210718234132.png]] - ![[Pasted image 20210718234132.png]]
- a control structure is a system model that is composed of feedback control loops. - a control structure is a system model that is composed of feedback control loops.
- a good control structure will enforce the system level constraints. - a good control structure will enforce the system level constraints.
@@ -25,4 +27,6 @@
- vertical axis represents a hierarchy ([[heterarchy]]? perhaps in voting systems) - vertical axis represents a hierarchy ([[heterarchy]]? perhaps in voting systems)
- [[responsibilities]] can be assigned to each control structure entity; they are refinements of [[system level constraints]] - [[responsibilities]] can be assigned to each control structure entity; they are refinements of [[system level constraints]]
- [[feedback]] can be derived from [[responsibilities]] (which information does the process model need to contain?) - [[feedback]] can be derived from [[responsibilities]] (which information does the process model need to contain?)
- step three: identify unsafe control actions]] - step three: [[identify unsafe control actions]]
- an [[unsafe control action]] is