Merge branch 'master' of github.com:flancian/garden

2021-07-19.md

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+- [[stpa]]
+- [[japanese garden]]
+- [[magic mushrooms]]

japanese garden.md

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+- a [[space]]
+	- [[sound]] https://mynoise.net/NoiseMachines/japaneseGardenSoundscapeGenerator.php
+		- [[go]] [[sound]]

magic mushrooms.md

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+- a [[thing]]
+	- [[go]] https://en.wikipedia.org/wiki/Psilocybin_mushroom
+	- https://twitter.com/flancian/status/1417194313826684932

system theoretic process analysis.md

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 		- [[feedback]] can be derived from [[responsibilities]] (which information does the process model need to contain?)
 	- step three: [[identify unsafe control actions]]
 		- an [[unsafe control action]] is one that, in a particular context, will lead to a [[hazard]].
-		
+		- it must include the actual (real) context in which the control action is unsafe, instead of controller beliefs; and it must be linked to a hazard.
+		- define [[controller constraints]]: behaviours that need to be satisfied to prevent UCAs. they can usually be derived from negations of the UCAs.
+	- step four: [[identify loss scenarios]]
+		- a [[loss scenario]] describes the [[causal factors]] that can lead to the [[unsafe control actions]] and to [[hazards]].
+		- 4a: write scenarios which cause UCAs
+		- 4b: write scenarios where control actions are ont followed