Mel,
Fair enough, but I use the product of skill and experience as the simplest form of explanation. Knowledge has to be gained as a prerequisite of developing the skill.
As to judgement vs situational awareness...
A low level of individual or collective situational awareness places an individual or crew in a position where they are not in receipt of all of the cues to fit in with the true state of events. Thus, an erroneous mental model may be formed. Decisions are then made based on this erroneous mental model. These decisions may be correct given the mental model formed, but in reality are incorrect. Rule based mistake.
If other cues exist which would normally raise some 'red flags', but are overlooked, the bias of hindsight would suggest that 'poor' judgement was exercised. Of course, criticism here aimed at the individual or crew discounts other factors which may have precipitated the false mental model, i.e., high workload and associated load shedding, etc.
Sorry about the waffle, but, once again, for what it is worth...