What is the Shared Mental Model concept?

Looks like a term from Organizational Theory and Communication Theory especially.

Think of a 5-paragraph essay. The reader knows what to expect, and the reader knows how to encode an information.

1) Intro

2) Thesis 1

3) Thesis 2

4) Thesis 3

5) Recap / conclusion

Basically any agreed upon formalized process that determines behavior and expectations.