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I am not 100% sure, because you didn't answer 2 of that questions perfect (or you didn't gave me enough information.)

OK...I'll try to improve.

Clear is:
"You need a constraint "D is never allowed directly after an N day"?"" -> yes.
-> sadly FET hasn't such an constraint. But it might be possible to code.

OK.

Your "No, because for such worker there would be some N-N-N required." is only correct if there are as many guys working at day as at night and/or if you have only full time workers.
So there are working as many people at a D as at a N?

Yes.

And there is no one working half time / part time?

It might be that sometimes someone is scheduled to work part time, but for exact details I have to ask.

In general, one doctor+one tehnician+one driver form so called 'team', let's call it 'team-1' and, in general, they have the same schedule during the period of one month.

There is another team of such three persons which we can call 'team-2' and those two (team-1 and team-2) are covering emergency station A, and in emergency station B there is one such team at a time.

If you answer one of that with no, I need to know one more time again: "is it allowed to have D-D-D-D in four succ. days?"

Well, in general it is not, but for instance, my wife, due to having small baby was allowed to work D-D-....every 2nd day 'cause she was spared of night shift.

About:
"why is D-N-N not allowed?"
You only give an "I believe" answer. That is a typical mistake at timetabling. You might loose a lot of good results by adding unneeded constraints.
So in fact "D-N-N" is allowed?

Let me say that my original question was whether FET is, in general, appropriate tool to solve such kind of problem which is not in the scope of classical timetabling required in edu institutions.

That's why I really appreacite your readiness to help with it, but I feel unhappy burning your brain-cycles with possibly not 100% correct info, so if you believe that the problem is witing FET's scope, then I'm going to provide correct info and update the thread.

- is it allowed to have D-D-D-D in four succ. days?

No, because for such worker there would be some N-N-N required.

- you need a constraint "D is never allowed directly after an N day"?

Right, 'cause if N-D would be allowed it would be working 24h in 24h.

- why is D-N-N not allowed? (If i understood correct, then you can have "D-D-N-Free-D-D-N". So in my opinion "D-D-D-Free-D-N-N" isn't more worse (i think it is even better))

I believe, although I can check, that D-N-N would bring too many free days in succ.

As far as D-D-D-Free-D-N-N would mean 6 x 12hrs = 72 hrs per week which is too man working hours per month - above max. allowed by law.

Let's say that if we start on Monday, then the normal/regular shift is as follows:

Mon (D)- Tue (N) -Wed (free) - Thu (free) - Fri (D) - Sat (N) -Sun (free) or in total 4 x 12h = 48h per week.

Is it more clear now?

Hello,

I wonder if FET (can be) is used in non-educational fields?

In my instance, my wife is working in emergency and I know about the trouble of one person to put together schedule for each month.

There are two places for which they need schedule and the working shift is: 12hours day-shift (07-19h), then 12hrs night shift (19-07h) and then 2 days free, when there is new day-shift.

One place has two teams working at once (1 doctor, 1 technician and 1 driver), the other place has only one team.

Some of the constraints (of which I'm aware of) is the total number of working hours per month, it's not possible to work e.g. D-N-N, or D-N-D in three succ. days, but it's possible to schedule e.g. D-D-N in three succ. days, then the number of day & night shift should be balanced for each worker, the total number of hours should be balanced in the row of 3 months etc.

What do you think if it would be possible to tailor FET to accomplish it?


Sincerely,
Gour