One of the most effective instructional strategies I implemented in my high school math classes was cooperative learning. Students were actively engaged, struggling together to work out solutions to challenging problems. It was organized chaos - everyone had a role and played a part in the collaboration, but boy, were those kids digging deep and thinking. Hard. Sounds great, right? It was great, but it took time and lots of hard work on my part, and the part of the students, to get to that point.