Peer assessment and self-assessment is much more than children marking their own or each other's work. To improve learning, it must be an activity that engages children with the quality of their work and helps them reflect on how to improve it. Peer assessment enables children to give each other valuable feedback so they learn from and support each other. It adds a valuable dimension to learning: the opportunity to talk, discuss, explain and challenge each other enables children to achieve beyond what they can learn unaided. Peer assessment helps develop self-assessment, which promotes independent learning, helping children to take increasing responsibility for their own progress.