I assign a major presentation at the end of my classes and create the groups strategically. I break up the cliques and best friends in order to ensure each group is diverse in comfort, abilities, etc. One thing I ask them to do at the end is do a peer critique. I obviously monitor them throughout the process and can pick out who is doing the most work, who is contributing the least, but when they do the peer critiques, they will all say that they had a positive experience and everyone pulled their weight, when in fact, they haven't. I'm not trying to get them to tattle on one another, as I ask them very reflective questions (strengths, areas of improvement, etc.) but I would like them to feel comfortable giving constructive criticism to their team members and really assess their contributions. Their grades are not based off of their peer critique. In other words, just because they say a team member didn't contribute, that person doesn't automatically get a failing grade. Any suggestions on how to get more thoughtful peer critiques?