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يمكنك وسم الانشطة بوسم
وإضافة قاعة وهمية سميها عن بعد مثلا
واضف قيد قاعة مفضلة لوسم

Hi liviu
fet does not affect rooms for activities without a teacher, Although  additing constraints preferred rooms for subject or activity tag

 the 2 theachers have the same number of hours?

اذا كنت تستعمل منظومة مسار فالملف المصدر يتضمن قيود أدنى أيام جاهزة

Hi livui,

Continuing an old discussion,

As you know, to limit the number of different rooms allocated to a teacher per week, we use the constraint: activities occupy max different rooms.
 To simplify the entry of this constraint , is it possible to add a constraint based on the previous constraint, with which we can choose the teacher/all teaches and the maximum number of different rooms allocated to him.
By this constraint we will guarantee that the teacher works in a limited number of rooms per week, for example 2,

And  to make him works in one of these 2 rooms per day we will use the constraint, teacher's max room's change per day.

Thanks in advance and sorry for the many complicated requests

نعم طريقة الاستاذ الوهمي والقسم الوهمي هي التي تمكن من جعل المواكبة في اطراف الحصص الدراسية.

وسم واحد يطبق على جميع المواد الاربعة
وبما انها تدرس بساعة يوميا
عندما سنطبق قيد اقصى حصص متصلة مع وسم مشترك  للطلاب 2
هنا سيضع فييت ساعتين فقط من المواد الاربعة

قم بوسم انشطة تلك المواد بوسم معين
ثم استعمل اقصى حصص متصلة مع وسم مشترك 2

طريقة السيد جد ذكية

قيد انشطة تحتل اقصى فترات زمنية محددة
حدد انشطة القسم وحدد الحصة الثالثة في كل ايام الاسبوع وضع في الشغل 1

The constraint activities occupy max time slots from selection, give good result, you don't need a new constraint.

Thank you my friend
i undersund now 
I mistakenly thought the interval included the end hour

Can we use this constraint for one hour, because the interface forces us to choose an interval of at least 2 hours?
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For me, i use activity tag's to categorize the activities

Ok, i understand,

for the test, I tested 3 files on 2 computers, on version 6.5.7 and on the new version, with the same random seeds, the schedules are identical, the solving times are the same, the random seeds after are the same.

i also test the new constraint (min hours in the afternoon),it works and give a good results