In this chapter we use a different lesson, a lesson that was taught by another teacher, Ms H, who also participated in the WMCS professional development (PD) project. It was taught more than a year after the video of Mr T’s lesson was taken. In the intervening time, the 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 or procedure, and on why the words you use to talk about mathematical ideas in class are important. Our purpose here is to move from the analysis in Chapter 5 to our interpretation of this for our PD work.
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