How is learning in a group more valuable than the sum of its parts? And how can we communicate this added value to the students efficiently. A main challenge, in my opinion, rests on the individual personalities of the group members. There will always be cultural differences that affect the work, but in the end the way to make it horizontal, equal and collaborative, is if all the individuals decide to take their behaviour to a level that ensures it: the natural leader will tone it down, and use their abilities only for the common group. This makes the group work a very volatile instrument, but also a very precious one: no matter how well you arrange the instructions, how much you take into account the cultural differences between the students, in the end it relies on how collaborative your individuals are (or can be made).