In Tutoom you can create Rooms to make participants work in work groups.
To do this follow these steps:
Go to Rooms in the navigation bar.
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Click on Create Rooms.
Choose the number of Rooms, you can add + or remove - as many as you want.
Choose the duration of the rooms, you can increase or decrease the time by 5 minutes.
Edit the rooms, leave them empty or fill them randomly.
Click on Create.
You can enable the permission for new participants to enter Rooms randomly.