The critical role of task development in lesson study

While many aspects of Lesson Study are characteristic of effective pedagogy, the task or problem is perhaps the least understood by non-Japanese adopters of Lesson Study. In this chapter we focus on the pivotal rôle played by the task in the Research Lessons of Lesson Study practice in Japanese primary school mathematics. The metaphor adopted is that tasks are akin to icebergs, where most of the support is hidden, and is used in order to raise awareness of the bases of effective tasks. Examples of such tasks are described as they were presented in classrooms in both Australia and Japan.