The use of high-quality assessments by well-trained teachers exercising great professional judgement is a core goal of the AMPP Guide. Making more out of assessments in schools does not mean doing more assessments, doing more marking; it means we should look critically at the reliability, validity, purpose and value of all types of assessment used in our schools, and it prompts us to question the opportunity costs of each assessment you use. If assessment in your school performs a function to support learning that no other tool could, and it does it so in a way that provides reliable data to draw valid inferences about learning, you will be well on your way to great assessment.