The Wikipedia article on Situation awareness (SA) is good.
According to the article the term SA was used by the U.S. Air Force where pilots came to equate it with Col John Boyd’s OODA loop.
I just came across Dr. Mica Endsley’s model recently: Endsley’s Cognitive Model of SA
The basic outline of Endsley’s model are very similar to Boyd’s loop but Endsley’s model breaks down the details differently
Boyd’s OODA is Observe, Orient, Decide, Act. In Endsley’s model both observe and orient are in a single SA block but Endsley breaks the two steps (observe and orient) into Levels 1, 2 and 3.
Endsley’s paper: Towards a Theory of Situation Awareness in Dynamic Systems can be found on-line.
Here’s section that’s relevant to BRM.
The paper is from 1995 and the model is applicable to any domain that requires SA including law enforcement, aviation, air traffic control, ship navigation, health care, emergency response, military command and control operations, transmission system operators, self defense, offshore oil and nuclear power plant management