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This new constraint would allow a defined set of activities to overlap in time (partially or fully).

Possible use cases include:

-Two or more teachers working at the same time.
-Two or more student groups scheduled at the same time whenever possible (for example, to ensure they can share the same school transport in rural areas).
-Synchronizing multiple sub-activities in pairs (such as English and Spanish lessons running in parallel).

This constraint is related to the existing "A set of activities occupies max selected time slots", but it would be more practical to have a dedicated one for overlapping activities.

If it is easy to implement, the new constraint would be very useful. Otherwise, the existing constraint can still be used as an alternative.

I would like to sincerely thank you for your dedicated efforts.
I feel truly proud and delighted to have contributed, even in a modest way, to the ongoing improvement of fet.
I only regret not having preserved and further developed my programming skills, which would have allowed me to engage more deeply with the source code of software.

You are welcome my friend 😊😊

[Teacher(s) occupy max different rooms]

Hi my friend liviu,

First, please allow me to apologize for the many requests we, Moroccan users, tend to make. Many thanks for always being so quick and supportive in your responses.

In Morocco, it is often very difficult to assign one teacher to the same room throughout the entire week. Teachers usually have to use more than one room.

Currently, the only way to control this situation in FET is by assigning a large number of possible rooms to a teacher's activities, and then adding the constraint "activities occupy max different rooms". While this works technically, many users find it complicated and not very intuitive, since it requires select theacher's activities.

To simplify this, I suggest introducing a new direct constraint:
"Teacher(s) occupy max different rooms"

This constraint would allow the user to directly set the maximum number of different rooms a teacher may use, without having to go through the step of selecting activities.

Such a feature would be especially helpful for Moroccan schools (and possibly elsewhere) where room allocation is highly constrained and teachers are often forced to rotate between several rooms.

Thanks to your dear mother
May she always stay healthy and happy.

Ok, you can use darkolivegreen as 3rd color.

Great suggestion. As for the 3rd color, I recommend DarkCyan.

I would suggest, for example, the following colors, which are far from dark red/green:

MediumBlue #0000CD Yellow #FFFF00 Orchid #DA70D6

Hi liviu

from the comments on Facebook I noticed that users were confused because of the dark green and dark red colors, which are usually associated with constraints like teacher not available times.

I agree with your suggestion: the first three colors should be clearly different from the ones typically used for such constraints.

Mybe an option "days sparated" is solution,

You need to add the constraint day by day,
that is, for each day of the week a separate constraint has to be added.

i edit the message

I am looking for a trick to simplify the process with a single constraint 😁.

Similar to the case of 2-hour groups, it should be enough to use the constraint set of activities has same starting  day, and the program will automatically group them within one half-day.

You are right, an additional constraint Activities same day should be added to avoid spreading them across different half-days.

To simplify the grouping of scientific subjects without using the constraints Activities are grouped and Activities same starting time,
 I considered applying the constraint Activities max hours daily span set to 2.

Would this effectively ensure that the subgroups' activities are scheduled in two consecutive hours within the same half-day, as illustrated in the picture?