What if the above diagram did not represent the passage through (Dutch) education but a literal representation of the physical layering of secondary school over primary school? You would think about doing this if you could build a high quality for low cost. A compact architecture could reduce build costs down to £1100/sqm! A combined school would undoubtedly present a political maelstrom which would have to be (intelligently + sensitively =) sensibly resolved but, for starters, the identity between the two student age demographics (primary v secondary) could be maintained if the circulation were separated (so big kids age 11-18y did not bully little kids aged 4y-10) by mid floor landscapes of play!