“In the last round of debriefing sessions (April
1994) [held after a demonstration lesson given
by Deborah Ball], I was struck by the attention
teachers gave to the mathematics of the lesson.
They listened carefully to what the children said
and considered what these comments reflected
about their understanding. Furthermore, the
feeling that Deborah was a model who demon
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strated strategies they should judge seemed to
have disappeared. Rather, Deborah’s teaching
gave them a context for reflecting on issues of
learning and teaching mathematics. The fact
that some teachers...chose to co-plan with Deb
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orah, do the same lesson in their different class
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rooms, and then debrief together illustrates a
dramatic shift in the teachers’ relationship to
Deborah, to each other, and to their work.”