The participants should know beforehand that they have to work on the task together or, if they start doing it individually, that the first one who finishes has to help the others. They all have to share their thoughts and conclusions about the task so that they all understand the activity and there is not anyone who is left behind.
A practical example:
A teacher of an ICT course explained that in the course he teaches about Smartphones, he dedicates the first class to explain how interactive groups work, so that participants understand the importance of working together and that it helps everyone reach a better understanding of the contents, and faster as well. Since participants are often used to a class where the teachers explain everything, it can take some time for them to get used to it, but this teacher says that if he dedicates time during this first class to explain how the interactive groups work they come back with less fears and with more disposition to work together in groups the next class.
Teacher of a course about smartphones.
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