Just as with any other new strategy you introduce, I would recommend ensuring the opportunity for students to test out each of the group roles. When I implemented this for the first time into my classroom I assigned roles to each student. I ensured we discussed the responsibilities of each role, and modeled any behaviors they would be displaying as necessary. As students worked through the experiment, I would act as a guide ensuring they were on task with the experiment, while also providing support over their group role. The next experiment we completed, I would again assign roles to my students. This time I would ensure that the roles students were given were different from those previously assigned. Again, I would review expectations and act as a guide. This pattern would continue until everyone had an opportunity in each role. As the year progressed I would continue to assign roles to individual students based on their strengths. Towards the end of the year when students were familiar and comfortable with these roles I would allow them to decide which role they felt would be the best fit. While it was a gradual release of responsibility and choice, the skills students learned through the process will benefit them long past the time they left my classroom.