Very effective resource used throughout or at the end of a lesson as a self or peer assessment tool to evaluate learning. This is a formative and cooperative way of assessing a students understanding, and a great motivator for students of any age.
It is a very effective tool to encourage students to identify their own next steps in learning, as well encouraging them to share their reasoning with the teacher and peers.

Most effective when used as permanent working-wall and referred to consistently, especially during plenaries.