Students working in a group circulate their work to other members of the group and each adds a post-it note with suggestions on how to improve the work.

Students identify homework questions they could not do, put them on the board, and solve them for one another. The teacher only needs to work on those problems that no-one else can solve.

Students exchange books and give comments to a peer by writing 2 positive things (stars) about the work and 1 thing that s/he "wishes" the other student would do to make it better. The comments should be specific to the qualities of the work and provide clear guidance on what to do to improve.