Although she wasn't told this when hired, at her new job Donna noticed that the employees eat lunch at their desks while continuing to work and that on Fridays most everyone dresses casually. These behaviors are most likely part of the:

organizational culture  

Explanation:

Although she wasn't told this when hired, at her new job Donna noticed that the employees eat lunch at their desks while continuing to work and that on Fridays most everyone dresses casually. These behaviors are most likely part of the organizational culture. Organizational cultures are the rules, guiding principles, philosophies that guides the behaviour of member of an organization, it is the shared belief, values which govern how people behave in an organization. This is seen in their work ethics, dressings and interactions within the organization