to design a sequence of lessons according to well-considered objectives;
to predict what may happen in a lesson;
to have a group of observers bring multiple perspectives to what happened,
without prejudice; and ultimately
to improve the teaching of mathematics for all.
Lesson study is based on a wide range of communal sharing of objectives. At the
meeting I was impressed by one essential fact voiced by PatsyWang -Iverson:
The top eight countries in the most recent TIMMS studies shared a
single charactistic, that they had a smaller number of topics studied each year.