Hi Caridad! I too have found that students enjoy the latitutde of work and learning in the group setting. There are though, as you referenced, those that do not carry their weight - not fair, but certainly characteristic of the classroom and the workplace.
I think making sure the group members'roles and responsibilities are clarified and communicated, minimum expectations identified, ground rules established, and desired outcomes projected certainly helps, and it seems that group members will often use peer pressure to bring group members up to par.
Thanks again for your input!
Jay
ED106