# Commentary

Look again at the diagram below. We are focusing here on the third circle.

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## Pedagogic strategies

SBTD is about sharing ideas. But this means more than just a casual conversation. Just as a doctor will develop certain ways of treating illness (updated to take account of new medical research), so a teacher builds up knowledge of teaching topics and subjects. Perhaps in education we have not been so good at recording and cataloguing such knowledge. But times are changing. The days when a teacher would go into the classroom and just teach from the textbook, or when the teacher knew about what was happening in their classroom but no one else’s — these are models that can now be seen as too solitary.

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