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Please read the chapter "Years, groups and subgroups":
https://www.timetabling.de/manual/FET-manual.en.html#id_12

Ask again if you still don't understand it.

I have read but I do not really understand how to put

I am having trouble preventing two sets of activities from overlapping in the same time slot.

Current Setup:
Students: I have two groups, 1A and 1B.
Activities:
Set 1: Subject A and Subject B
Set 2: Subject C and Subject D

Current Constraints: I have used the "A set of activities have same starting time" constraint so that 1A and 1B start Subject A/B, C/D together.

I want Subjects A & B to happen simultaneously (split between the two groups) in one block, and Subjects C & D to happen in a different block.

Currently, FET sometimes schedules all four subjects (A, B, C, and D) in the same time slot. I need to ensure that the "A+B" block and the "C+D" block never overlap.

The result should be:
Slot 1: 1A does Subject A | 1B does Subject B (Simultaneously)
Slot 2: 1A does Subject C | 1B does Subject D (Simultaneously)

How do I achieve this?

I have several class(1A and 1B for example) and subject, for example i have subject: A B C D, I want subject A and B to start together(which is fine with constraint), and subject C and D starting together, but do not overlap A B with C D, how should I set for the subgroup? The current attachment is just for reference for just in case.

In my place, most of the school is using aSc, now I know why they used to it
We need to add another function "test" for system to check if the activities is fit to each card before we generate, it is hard to find which activities in which classes in FET, I need to guess the impossible.

Attached file for anyone who can help me how to adjust... I really have no idea how now

Hello,

Absolutely no problem!

FET reports the conflicts after the generation, which will show a 10'000 weighted conflict for each unplaced activity. Or on a locked timetable use a filter on the activities, detailed description with constraints does not contain the string for activity preferred starting time. Or in activities.xml in results check for empty day/hour (something like <Day></Day>).

Thank you so much, however, I have problem generating my timetable... I really need some help...
I am wondering, it is wise to split the duration into smaller pieces? For example: 2 duration, i split into 1+1 duration...

Hi, sorry to open a new topic to this, because i tried google but no luck, how and where can I check which activities is not scheduled/placed? I tried looking but couldn't find where. Thank you very much <3

Oh, in this case you might want to use the relatively recent constraint of type students max activity tags per day from set, adding a different tag for each different activity.

Noted, which mean 1 activity per tag, by using constraints of type students activity tag max hours daily, and set maximum to 4.

Thank you very much

O

No new constraint was designed for this. You still need to use constraints of type students activity tag max hours daily.

I just notice I ask the wrong question, it should be maximum activity per day
For example, Monday can have up to four unique activities. Even if "Activity A" is repeated several times, it still counts as one of the four allowed unique activities.

How can I implement this rule?

No new constraint was designed for this. You still need to use constraints of type students activity tag max hours daily.

Ok thank you very much for the reply

I am wondering, if there is any constraint that set the maximum same activity per day per class now? For example I want to set maximum 4 same activity for a class, it doesn't matter if they are repeating the same activity for the day.

Hello,

I think you can try:

1) Use buildings and building changes constraints;

or

2) Use the constraint(s) teacher(s) min gaps between ordered pair of activity tags.

Thank you very much sir
I love your software and it is so great!

Hi there, I think this is asked several time, I did search but I don't want to use a custom version.
Year 1,2,3 is at building A, year 4 is at building B and year 5 is at building C.
Is there anyway to add constraint saying that class year 1,2,3 should not start after having class of year 4 or 5? So I can add a gap for teacher to reach another building. Thank you.

You can't place 2 activities at the same time if they have got the same teacher or students. that is impossible.
You can fix that by:
a) doing the correct students struture. see https://www.timetabling.de/manual/FET-manual.en.html#id_12
b) removing the dublicated teacher/student from the second activity
c) just place them all into a single activity

You can find "both subjects names at the same time" if you just add A subject by FET -> Data -> subject. (FET will ask for ONE subject, but you can simply write BOTH at the same time. For example: Instead of two subjects "Mathe" and "English" just write 'one' subject "Mathe/English".)

Understood very well, thank you very much.

"Two activities are grouped" = not the same slot
"A set of activities have the same starting time" = same starting slot

it's a bit on depending of your correct needs.
You might use "A set of activities have the same starting time", setup the correct students structure or just add a new subject with "both subjects names at the same time"

Thank you but using "A set of activities have the same starting time" still showing the message of extra slot detected

Cannot optimize for subgroup TINGKATAN EMPAT BERLIAN PM Automatic Subgroup, because the number of hours for subgroup is 59 and you have only 57 free slots from constraints students set not available and/or break.

I wonder what I did wrong. Attached FET file.

And where can I find "both subjects names at the same time"? I couldn't find it anywhere.

Is there anyway to combine 2 subject into 1?
I used "Two activities are grouped" and "A set of activities have the same starting time" but it still show extra hour when generate.