To support teachers in implementing ambitious reform efforts, professional developers and teacher educators need to know more about teachers' thinking about argumentation. Specifically, there is a need to understand more about teachers' views and evaluations of "students'" mathematical arguments as they play out "in practice."…

Researchers engaged in a collaborative, yearlong study with a seventh-grade language arts teacher who integrated activities to enhance students' understanding of mindsets with content instruction. Lessons emphasized four aspects of mindsets: belief that learning abilities can grow with the investment of effort, willingness to address challenging…