Setting group data
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Setting group data means to set number of groups and upper and bottom limits for size of groups:
Divider will try to guess those values, but you should inspect and change them as necessary. Number of groups can be between two and eight and group size must be in accordance with number of groups and number of pupils. Even if you set wide group size limits (as in the picture above: 30 and 34), Divider will try to make group sizes as equal as possible. Setting wide group size limits will only give Divider space to solve some harder problems, e.g. when dividing into groups is possible only if groups sizes can vary significantly. Here is a simple example for that kind of situation: there are 64 pupils, they should be divided into two groups and 34 pupils would like to be in the first group. Obviously, setting both group size limits to 32 will make dividing impossible, but setting them to 30 and 34 will enable it.
After number of group and groups size limits are set, you can press the "Divide" button which will start the process of making groups. This process will quite often write additional data to the table in the working area, so it could be a good idea to make a backup copy before starting if you think you might need to go back to the original data. It is not possible to estimate how much time it will take as it depends very much on the input size, number of pupils conditions that should be satisfied and relationships between them. During this process a window with a "Cancel" button is shown, in case you decide to abort making groups:
Making groups can take less than a second on an average computer, but it can also take more than a hundred years. If Divider cannot make groups for hours, you should consider aborting and setting different pupil conditions. If Divider can't pass the fourth step (step 4/5) it might be a good idea to change the algorithm in the "Settings" window before trying to change pupil conditions. Also, in some cases Divider will conclude that it is not possible to make groups with given conditions which is surely a reason to set different pupil conditions or number and size of groups.
After all pupils are allocated in their groups, the "Group" column will appear in the table and progress window for groups making process will close.