Let’s face it, teachers are creatures of habit. They like the way they do things because they are their way.
They like to work within departments because it is their department. Most schools will find that English, Science, Maths etc. will stay within their departments for meetings, breaks, lunchtimes because then they can discuss classroom antics with their colleagues that understand what they are talking about.
Drama and Music Departments
You normally find the smaller departments such as Drama and Music and the teaching assistants in the staff room as otherwise they would be alone. But this doesn’t really help to foster a collaborative feeling in a school or communicate to the students or visitors that the school works as one.