Question

________ is the set of shared, taken-for-granted implicit assumptions that a group holds and that determines how it perceives, thinks about, and reacts to its various environments.

Answer 1

I believe the answer is: Organizational culture

Organizational culture would create an unique environment for the employees which could influence the performance of the employees.
For example, some companies value human relationship above others. So they require each of the employees to say 'good morning' to one another everytime they come to work.