ABSTRACT
This chapter explains a lesson that was taught by teacher, Ms. H, who also participated in the Wits Maths Connect Secondary (WMCS) professional development (PD) project. In the intervening time, WMCS teachers learned about the benefits of well structured example sets for their students' learning in the PD. The teachers also had opportunity to work on what was a good explanation or justification for a particular concept, and on why the words you use to talk about mathematical ideas in class are important. In a Lesson Study cycle in the project, a group of teachers worked together with a project member to plan, teach and reflect on a lesson. The chapter shows what is possible when the planning and implementing of a lesson have been informed by insights from research. It uses Ms H's lesson plan and parts of its implementation to show what opportunities to learn are opened up when there is deliberate attention to selecting and sequencing examples.
