There are plenty of rooms that hold 15. Table and chairs. Equipped with technology. High noise level. Used much more than SC0331.
Sciences have specific rooms as do languages and fine arts.
Other departments get what is left. Need to either build more shared spaces and build kinship between nomadic departments, or build more specific departmental rooms to build ownership and tolerance. If room has specialized equipment for class that needs to be available and can't be booked, it should be labeled a lab.