Classes of students starting classes at different times

[Marcio]

Hello, I'm starting to use FET and I have this problem. A course has some particular features. In this course there are 24 classes of students divided into three groups of 8 classes. The 24 classes share all spaces. However, each group of 8 classes has its own group of teachers. The biggest difficulty I found, is that each group of 8 classes, despite using the same spaces, have different schedules that overlap. Classes for the first group start at 7 am and go until 5 pm. For the second group, they start at 8 am and go until 6 pm. For third group, they start at 9 am and go until 7 pm. The Classes are one hour long with a twenty-minute break.Each group has a 90-minute lunch break starting at different times.

How to work with periods per day starting at different times?

[Liviu Lalescu]

Hello, Marcio,

Isn't this as simple as adding constraints students set not available?

[fourat]

How many rooms do you have in your school ?

[Marcio]

For each group there are 4 classrooms available. However, we have classes in the gym and there is only 1. We have two dojos for the 3 groups.

[Marcio]

Thanks Liviu for answering me.
So, initially, it generated the timetables individually for each group. For example, group 1 used the gym at a different time interval than the other groups. I did the same for the other two groups. But managing shared spaces between groups "manually" generates a lot of work.
These are the periods per day that each group has:

7h30 - 8h30
8h50 - 9h50       8h30 - 9h30
10h10 - 11h10       9h50 - 10h50         9h30 - 10h30
11h10 - 12h40       11h10 - 12h10         10h50 - 11h50
12h40 - 13h40       12h10 - 13h40         12h10 - 13h10
14h - 15h               13h40 - 14h40         13h10 - 14h40
15h20 - 16h20       15h - 16h                 14h40 - 15h40
16h40 - 17h40       16h20 - 17h20         16h - 17h
                             17h40 - 18h40      17h20 - 18h20
                                                              18h40 - 19h40

[Liviu Lalescu]

Oh, now I see the problem.

I would suggest you to consider a FET hour = real 10 minutes. An activity will have duration 6, break will have duration 2, and lunch will have duration 9. FET hours will be:

7:30,
7:40,
7:50,
8:00,
8:10,
8:20,
8:30,
8:40,
...,
19:30.

So, 12*6+1=73 FET hours per day, if I calculated correctly.

You will add then not available constraints for students.

I don't understand the thing with dojos.

You can add home rooms for each students set with 100% and preferred rooms for subject sport with 100% to the gym.

Please let me know.