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diff --git a/stpa handbook.md b/stpa handbook.md
index 880a49d56..c7eb297d2 100644
--- a/stpa handbook.md	
+++ b/stpa handbook.md	
@@ -46,4 +46,7 @@ Refining control structures:
 
 ![[Pasted image 20210719000516.png]]
 
-![[Pasted image 20210719001721.png]]
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+![[Pasted image 20210719001721.png]]
+
+![[Pasted image 20210719003446.png]]
+- ![[Pasted image 20210719003436.png]]
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diff --git a/system theoretic process analysis.md b/system theoretic process analysis.md
index f3f72f281..de777da88 100644
--- a/system theoretic process analysis.md	
+++ b/system theoretic process analysis.md	
@@ -24,4 +24,4 @@
 		- control goes down, feedback goes up
 			- 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]]
-		- [[feedback]] can be derived from [[]]
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+		- [[feedback]] can be derived from [[responsibilities]] (which information does the process model need to contain?)
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