We assess children's learning so that we know what to teach them next.
Learning, however, is not linear and takes time to embed into long-term memory. Forgetting is part of the learning process so teaching sequences will therefore need to be reviewed, repeated, revised and reassessed for us to know that the knowledge and understanding has truly been learned. This is an ongoing process and this regular evaluation of what has been taught, what needs to be taught, and what needs to be retaught and revised is at the heart of assessment.