The Basics of Diagnostic Teaching
In diagnostic teaching, teachers focus thoughtfully on what students do and do not understand and then adjust accordingly. This can happen at various times during teaching:
Teachers often learn a great deal about student thinking during
classroom discussion.
When working in groups, students plan and communicate with each other about their work. This provides teachers opportunities to listen in and to learn how students are integrating concepts and skills.
During student presentations, student teams explain and ask questions about the work of their classmates. This is a valuable time for teachers to learn where understanding is solid and where it is tentative.
Teachers can also gauge understanding by asking students to relate multiple representations
to each other. The ability (or inability) to see relationships and to articulate the underpinnings of mathematical approaches offers teachers insights about how students are thinking about the mathematics.