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Thank you, I'll try your suggestion.  The problem we're facing essentially just has one type of rooms which we call lecture room. An activity (in this case, lecturing a course) can be held in any lecture room as long as the capacity of that room is no less than the students involved.

Thanks again,
alin

Thanks but I'm still a little confused. Do you mean that each activity must have a (set of) preferred room(s) or the teacher/students related in that activity must have home room or preferred rooms?

Consider the following scenario: say I have about 100 activities and 50 rooms. There are some time requirements but no room requirements. In other words,  I don't care which room is assigned to which activity as long as each activity gets a room and no two activities will be in the same room at the same period.  In this case, do I have to add all rooms as preferred room for each activity? This seems a bit inconvenient because I think that an activity having no preferred room should imply that all rooms are OK for that activity.

Do I understand it correctly?
Thank you,
alin

Hi,
   I just started to use FET. I have a very elementary question. My test problem is very simple: one teacher, two student groups each corresponding to one activity that meets once per week for one period, two rooms, both big enough to hold either groups.  Only the basic compulsory constraints for time and space are set.  Then of course a timetable is generated immediately.  But the problem is that the room assignment is not shown anywhere.  How can I get FET to tell me the location of each activity?

Thank you very much,
alin