It is imperative that this strategy is always present in any teaching and learning situation. When students are given the opportunity of taking ownership of their learning experiences they will become more responsible human beings and be better prepared for the 21st century society.

The roles that each student had in the groups will be helpful to keep students on task, also to make sure that not just one student is doing all the work. The work is spread out across the group and everyone is in charge of something different. And the peer review at the end is awesome, because they are showing each other what is cool and selling to the students rather than making it informational and boring and proving to the teacher they know their information. 

It is great to see that student's take responbility for each role in groups.  The students are able to see what their strengths and weaknesses while doing group work. 

The idea that students are assessing each other is tremendously relevant. It truly puts the learning in the students' own hands. 

It is an absolute that children will learn better from working and researching with their peers rather than listening "lecture" stye to their teacher.