Visible Thinking is a research-based approach to teaching thinking, begun at Harvard's Project Zero, that develops students' thinking dispositions, while at the same time deepening their understanding of the topics they study.  Rather than a set of fixed lessons, Visible Thinking is a varied collection of practices, including thinking routines-small sets of questions or a short sequence of steps-as well as the documentation of student thinking. Using this process thinking becomes visible as the students' different viewpoints are expressed, documented, discussed and reflected upon. The book also comes with a DVD of video clips featuring Visible Thinking in practice in different classrooms.