teacher assessment at KS1 determines low (below 2), mid (2), high (above 2) attainment. With the development profile of 7 year olds being fits and starts and different paces, I would worry about the validity of that. Even anecdotally my eldest child, who is an academic high flyer at secondary, did not seem anything but middling until well into year 5 - and only really blossomed in year 7. At secondary its based on KS 2 SATS for DFE but many secondaries use their own / CAT assessments because the SATS do not provide an adequate baseline grade - progress measures though are still Key Stage 2 to 4 on the DFE It's a rum old world and no mistake - ho hum