This site gives a lot of useful advice about establishing whether you have a healthy school culture or not. It’s based on:
“1. COLLABORATION is characterized as the degree to which people work together, share information and instructional strategies, and are encouraged to have constructive discussions and debates.
2. COLLEGIALITY is about a sense of belonging, emotional support, and inclusion as a valued member of the organization.
3. EFFICACY, for the purpose of this process, tends to focus on how stakeholders’ view themselves. Do they feel as if they have control of their destinies or do they view themselves as helpless victims of “the system?” Do they respect research-supported evidence about good teaching or are they rigidly attached to the status quo?”
There is an assessment profile to complete if you wish.