Well, to do that, you'll need to do some textual analysis. but generally, style is not an issue with these things.
I didn't have a problem reading it, so what I'd expect to be the case would be:
Appropriate: the proper action for external reality* and the SOPs envisioned for it (*as argued for by the report).
Reasonable: an action that, giving the data available to the agent at that moment, would be correspond to a normative model for appropriate actions.
Understandable: an action that, while contrary to the normative model for appropriate actions, falls within the range of deviation considered normal for human actions.
Make sense?
Okay, how about:
Appropriate: the right thing to do.
Reasonable: should have been the right thing to do (and maybe was).
Understandable: seemed like the right thing to do.