In Finland, within very broad government guidelines, teachers create their own curricula together across schools in every community and district. They don't confine collaboration to their own individual schools and to just implementing other people's ideas.

Too often, shared visions really mean, "I have a vision; you share it!"

On school culture: It's hard to eat something you've had a relationship with.

Schools cannot shut their gates and leave the outside world on the doorstep.

Sustainable leadership does no harm to and actively improves the surrounding environment.

Singapore gives 10% "white space" time to all of its teachers to come up with their own innovations outside of the official curriculum. This encourages teachers to turn to their colleagues for inspiration and ideas.

Sustainable leadership does not compromise the future by expanding and accelerating too quickly in the present.