In the book Building Thinking Classrooms in Mathematics, each chapter explores one of the 14 optimal practices, beginning with a deep dive into what are the institutionally normative practices that permeate many classrooms around the world. It reveals how each of these practices is working against our efforts to get students to think, and then it offers a clear presentation of what the research revealed to be the optimal practice for each variable, unpacking it into macro- and micropractices. These descriptions are punctuated by excerpts from the data, anecdotes from teachers, photographs from real K-12 classrooms, and responses to frequently asked questions (FAQ). Each chapter concludes with questions for educators to consider on their own or within a professional learning community as well as "try this" tasks or activities teachers can implement in their classrooms.