NCTM standards and the Common Core standards emphasize communication as an integral part of how students should learn mathematics. This book provides a comprehensive approach to facilitating whole class math discussions and addresses how to set up a classroom, cultivate classroom routines, plan for instruction, facilitate discussions, and assess for future improvement. Reflective questions throughout the book enable teachers to develop professionally and support formal workshop or book study experiences. The accompanying PDToolkit website offers video clips from five real classrooms which illustrate whole class math discussions in action,  teacher and student interviews, and chapter PPTs for professional development sessions.