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Thanks for your reply, is that the only way to achieve this by making 10 (2*5) days? and need to double all the activities? (also need to double other time constraint?)

Besides, I want to know the usage of the following:

"A set of activities occupies max time slots from selection" and

"maximum simultaneous activities from a set in selected time slots"

Thanks a lot again!

Reviving an old topic:

The new constraint is ready: Activities occupy max rooms (in your case, 1 room maximum).

Attached is the solution to your original problem.

The new constraint was easier than I thought.

I'll add soon a snapshot and probably the new version 5.18.0 will contain this new constraint.

nomad, please let me know if I can make your file an official FET example (no copyright/privacy problems, or school's principal approval), and if affirmative, in which directories (country, city, institution)?

Can you explain more about the usage of "Activities occupy max rooms"?
I don't get the meaning in faq:

Q: How can I specify that some activities must be in the same room (at different time slots, of course, because a single room can hold a single activity in a certain time slot)? This is needed for instance to constrain the Physics activities of a certain students set to take place in the same room, be it Lab-1 or Lab-2

I go two activities, say A1, A2, I want them use the same room at two different week, say A1 use odd week, A2 use even week, is that I should use this constraint?

Thanks again for you reply.

Why do we need non-consecutive classes?
Actually I do think it is stupid because you have to take the lesson eventually.  The reasons is the administration of my school thinks that take double lesson is too long for teachers and students (55min + 55min).

Thank for very much for your help!

I would like to know will the dummy activities filled in the time-table? (because I got a full time-table, no free lesson for students)

besides, your suggestion is great but I got a lot of such non-consecutive classes which means I have to add a tons of constraint.

I really don't know how to do it and so I need help here, thanks a lot:

day per week = 5
no. of activities = 4
no. of duration = 5

That means I want to schedule 5 lessons in 4 days (2,1,1,1),
however, I  want the day with double lessons to be non-consecutive,
thanks!