Add some rules of thumb

modules/distributing/slides-distributing.md

@@ -95,9 +95,17 @@ Specify the dependencies in a file and let the user build their own environment,
 
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-## Drawbacks
+## Considerations
 
-Large amount of isolation enhances reproducibility but decreases flexibility.
+- Large amount of isolation enhances reproducibility but decreases flexibility.
+- Leaving it up to the user can be done for simple scripts (most research software)
 
+===
+
+## Rules of thumb
+
+- Simple scripts can use a simple dependency specification
+- If other software might depend on this software, package it
+- To archive a specific software version and its environment, you could use a container
 
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