When students interact with each other in well-structured assignments, they learn both content and group process skills better than students in traditional classrooms. That finding has established cooperative and collaborative learning as one of the most powerful and empowering resources to develop in the past thirty years. It has proven effective in diverse settings, from English Lanuage Learners to teams of Law students, all levels and all subjects. These sites will help teachers confirm and improve their efforts to make student-student interaction and support a key aspect of their classrooms.