For fans of the bestselling book "The Formative 5: Everyday Assessment Techniques for Every Math Classroom" comes this updated and expanded edition for understanding and implementing highly effective, research-backed formative assessment techniques into seamless, daily practice with students in grades K-12. "The Formative 5 in Action" serves as an interactive guide that steers teachers toward successful implementation of the formative five techniques of observation, interviews, Show Me, hinge questions, and exit tasks. This updated guidebook offers: (1) more than 120 minutes of video examples of the five techniques in action in real K-12 classrooms, showing teachers not just "what" to do but "how" to do it; (2) an engaging format with built-in reflection exercises and activities that foster individual professional learning and promote PLC study through discussion and collaboration; (3) an explicit emphasis on providing effective and timely feedback to students while harnessing student strengths throughout teaching and learning; and (4) comprehensive responses to teachers' frequently asked questions that have surfaced since the publication of the first book. The research is clear -- the authors' five formative assessment techniques lead to greater attention to planning, stronger instruction for teachers, and better achievement for students. "The Formative 5 in Action" is a truly engaging resource that helps mathematics teachers and instructional leaders engage in classroom-based formative assessment with precision, intentionality, and ease.