A teacher starts early

[stappix]

Some teachers are early birds and prefer the 1st time slot of the day.
I'd like to allow that -- as often as possible.

It will not always be possible due to conflicts with other constraints (rooms / students not available etc.). Therefore, a "teacher's not available times" constraint (allowing e.g. only the morning slots) will be too restrictive and lead to impossible solutions.

What's the best way to achieve this?

[Liviu Lalescu]

Probably activities occupy min time slots from selection or an equivalent reversed-technique activities occupy max time slots from selection. Please see the Help button for these constraints. You can use them in a progressive approach. For instance, you could force that a teacher will work at least 3 first-hours of a 5-days week.

Or maybe teachers interval max days per week, interval = last hours (but this is not as nice).

[stappix]

Okay, I'll try that...

[stappix]

It works this way:

Collect all activities of a teacher and create a "activities occupy min time slots from selection" constraint. "Selection" ist all 1st time slots of the days, and "Min occupied" is 5 (i. e. no. of days a week).
Generating a timetable will probably fail, e. g. because the teacher's "max days per week" is 4.
Just reduce "Min occupied" step by step until I get a feasible solution.

Thanks for the hint!

Regards,
  Friedhelm.

[Liviu Lalescu]

You are welcome, Friedhelm 

Liviu.