Time to move on from the ‘top down’ or ‘bottom up’ debate: MATs should give serious attention to collaborative standardisation Accountability and autonomy can be a hot topic for a principal who has moved from being head of a standalone academy to one which is now in a MAT. On the one hand, they are still the leader of their school, and responsible to their students, community and teachers for all that happens in it. On the other, the MAT CEO is now the most senior executive