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Great, thanks! Please go sleep, tomorrow at 10am Brussels time I do have a meeting with the principal online to finalize the schedule. She uses PenaLara software, I believe it should also be impossible for her, but as the principal she has more liberty to play with constraints. I will write tomorrow, and work during the night, you have been of great and much appreciated help.

WOW! I downloaded the file and ran it, and of course I can see that all the teachers mentioned do not work on Wednesday. If I understand correctly, it is better to start with a possible file and keep adding constraints and generating, and when the generation is not possible it is because there is a possible conflict or impossibility? I will work all night on this, loving and hating my life at the same time hahaha. I will keep you posted, thanks for the help!

OK. So, the constraints that are allowed to change are the following:

Teacher not available times:

* Lut Struyf: She has Wednesdays afternoons free. What she really needs is to have one afternoon free, that can be between Monday and Thursday (not Friday, because Friday afternoons are already free for everyone)
* Eduardo Santos: He has Fridays free. What he really needs is to have either Friday or Monday free.

Activity preferred time slots:
* VERGADERING: it is currently limited to Fridays on the fourth and fifth hour (10:20-11:10 & 11:10-12:00). What it really needs is to happen on Fridays.

I know it is too few constraints to break/change and see if it works, but at least for now, they are the only constraints that can really be changed (and probably the only ones, unless it is impossible to create a schedule. If that is the case, we can also completely delete the constraint of VERGADERING).

Thanks! I will check both of them, and consults with the principal. Sadly, it is in fact a mandatory constraint, he can only work on Fridays. What other things could I consider trying out while keeping his constraint?

Than you very much for your fast answer Liviu! I did notice it was stuck on 147, and from what I understood, I had to check k+1 (148). I checked 147 and 148, but either I don´t find or I don´t understand what the problem would be. Again, amazing software, I have learned so much this week. And am still curious on how much more I could learn if the constraints were more difficult, or there were more activities, more students, etc. But the software seems to be pretty strong and considers a lot of scenarios.

I have been reading pdf files, watching videos, and looking for some answers on the Forum... but I can not find how to solve whatever the issue is that I am having (I can not even understand what might be the problem with my current timetable). I have been running the program several times, but it does not deliver any final timetable. How can I find someone to help me out, a donation to the creator(s) of FET was already on mind, but I have not been successful in creating a final timetable (or timetables if possible). HELP! THANKS!

One thing that could be part of the problem, is that I might have some problems with activities that are scheduled the same day, but there might be a constraint (or a lack of it) that does not allow for the system to consider the option of putting them together. The first time I ran the program, I was able to learn that I was creating the activities incorrectly (I was not giving them splits, so they had to be continuous/together/next to each other/immediately after the other). I made the correction, and when creating the activities, I created a split for them (if the class is of 2 hours, 2 splits. 3 hours, 3 splits. etc.) and I left the option of "if a same activity appears more than once in the same day, put it together" marked, but that seemed to be a mandatory constraint instead of an optional one. Finally what I did was I left the option unmarked, but that seems to be a mandatory constraint that if they are on the same day, they can´t be together OR that they can not be on the same day?

This journey has been amazing so far, but it is not over, and time is running out. Thanks again!