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Thank you Volker and Liviu.

Our teachers are requesting to keep the daily subjects in a predictable order, when possible. Not necessarily consecutive. And not necessarily with the same starting subject every day.

For example, if you (a student) have already had Mathematics today, then you know the next daily subject will be Science. And if you have had Science, then next period in which you have a daily subject today it will be History.  And if you have had History, then the next daily subject will be English. (Of course, other non-daily subjects like Physical Education, or Technology, or Art, or Music may come between these daily subjects. And you may not start each day with the same daily subject.)

Are there a set of constraints that might make this possible in FET?

Thanking you

Thank you for your speed response, Liviu. I'll create the simplest CSV/.FET I can, to isolate the problem, and then will share it with you. 

I am a first time user. I have put in over 100 hours learning to use this wonderful tool. A VERY BIG thank you to the contributors who make this possible.

My school's upper division works on a 45-minute block. I am able to generate timetables for them.

Our lower division works on a 15-minute block; some 30-minute periods, some 45-minute periods, and a few 60-minute periods.  I am able to generate timetables for them too.

We have a handful of teachers who teach across divisions, and a few rooms that are shared.

So I tried a 15-minute block to generate a whole school timetable. And I am running into problems.

Even if I create a timetable for just ONE grade, what was working in the 45-minute version doesn't work anymore in the 15-minute version.

In the 15-minute version, I have tried adding the time constraint "A set of activities has a set of preferred starting times" with weight=100. The starting times are at 45-minute intervals. E.g. 8:30, 9:15, 10:00. But this does not seem to help. I have also tried setting the weight to 0, and/or the Consecutive flag to blank. All to no avail.

Here is an example of my CSV
Subject,Total Duration,Split Duration,Min Days,Weight,Consecutive,Comments
Math-5,5,,1,100,y, this is the 45-minute version
Math-5,15,3+3+3+3+3,1,100,y, this is the 15-minute version

Do you have any tips for me on how best to implement a 15, 3+3+3+3+3 duration?

Thank you