Double period
Lessons will be scheduled in single periods unless specified otherwise. Enter double periods in the column Double pers. if they are desired or permitted. Use this field to specify a permitted range of double periods:
An entry of 1-1 indicates that the range is from 1 to 1, i.e. the lesson should be scheduled in exactly one double period.

An entry of 0-1 means that a 2-period lesson can be scheduled in a double period, but it is not an absolute requirement (minimum 0, maximum 1 double period).

An entry of 1-2 means that a 4-period lesson can also be scheduled in one double period or two double periods. The timetable algorithm should decide which variant is best suited from the overall timetable perspective.

Tip: Double period condition
If it is possible to allow variability in scheduling double periods (e.g. with the 0-1 or 1-2 options), please allow the algorithm to work with these freedoms since this can lead to a significantly better overall result.
Block
More than 2 periods scheduled consecutively are called a block of periods.
If you wish, for example, to schedule 3 periods consecutively, enter '3' in the column 'Block'.
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If you wish to schedule a 6-period lesson in two blocks of 3, simply enter '3.3'.
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