Class groups, teachers, subjects, courses and lesson sets can all be configured to prefer one or more rooms.
Add a preferred room to indicate that lessons in which one of the above entities participates should (or must) be scheduled into that room.
Required
If a room is required, it is the only allowed room and the lessons of the configured entity may only be placed there.
To specify a mandatory choice from two or more rooms, mark all of these rooms as required.
Weight
Increase weight for rooms with higher priority. This usually only makes sense when there is a choice between two or more rooms.
Remarks
Enter an explanation for the room preference.
The controlling constraints are
Lesson: * preferred room, where * stands for each entity type with room preference.