Knackered knees, Heterogeneous vs homogeneous, and more. In this episode, Andy, Robin, and Adam continue the discussion about Japan, this time asking why they and other high performing nations choose to not formally test younger pupils. Why do we have a KS1 SATs test in the first place? Why do high performing nations not have these tests? Plus, Adam discusses what non-statutory KS1 SATs in the UK will look like next year.