The difference between a good educator and a great educator is that the former figures out how to work within the constraints of traditional policies and accepted assumptions, whereas the latter figures out how to change whatever gets in the way of doing right by kids. 'But we've always...', 'But the parents will never...', 'But we can't be the only school in the area to...' - all such protestations are unpersuasive to great educators. If research and common sense argue for doing things differently, then the question isn't whether to change course but how to make it happen.