“Tribes” is a more holistic, school-wide—and even school district-wide—approach to collaborative learning. Their home page information claims that “Thousands of schools throughout the United States, Canada, Australia and other countries have become Tribes Learning Communities…” Among the many features of a Tribes community, students learn in groups that are maintained for a long term, hence the descriptor, “Tribe.” In this context, “The focus is on how to: help each other work on tasks; set goals and solve problems; monitor and assess progress; celebrate achievements.” This short YouTube video (also from the Tribes home page) tells you more: https://www.youtube.com/watch?v=clVWgrCbm3c#t=105.