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See, thanks a lot. If I use method 1, but I have set all constraints of the Timetable, will it affect the constraints? Eg, I have set many constraints that activities prefer hour.

Hi, In our school, there are 9 lessons on 1 day. There is a break per each 3 lesson slot. There are 3 subactivities from different classes but need to be held on 3 consecutive lessons. They cannot be seperated by any break. The order can be ignored.  How should I set?

Indeed 

But please tell me if this works: add a dummy activity without teachers/students, duration 2, and two constraints activities not overlapping: dummy and activities of T1, then dummy and activities of T2 (if you have two teachers, T1 and T2).

Please tell me if you manage to obtain a timetable in this manner, so I can evaluate the efficiency of some constraints.

Yes, this is great idea, thx

Thanks at all,

Moreover, if several teachers need to be free together in any 2 continuous lessons in one week, how can I set the constraints?

Many thanks

I think you can add an activity with duration 2, no students, and these two teachers.

However, it will make other problems such as the max number of activities per day because it is not actual activity. For example, there are 9 activities per day and max number for each teacher is 7. If teacher who has 7 activities on monday and the common free lessons are set as you mentioned, it cannnot be set on monday, right?

Hi, thanks for the contribution of FET team
Here is a question. After I generated a table, if I want to modify some of activities on the timetable (eg exchange 2 activities in the same class) how can I do? Will fet check whether the change crashes the constraint I set before?

Moreover, if several teachers need to be free together in any 2 continuous lessons in one week, how can I set the constraints?

Many thanks