This comprehensive handbook synthesizes the best current knowledge on teacher professional development (PD) and addresses practical issues in implementation. Leading authorities describe innovative practices that are being used in schools, emphasizing the value of PD that is instructive, reflective, active, collaborative, and substantive. Strategies for creating, measuring, and sustaining successful programs are presented. The book explores the relationship of PD to adult learning theory, school leadership, district and state policy, the growth of professional learning communities, and the Common Core State Standards. Each chapter concludes with thought-provoking discussion questions. The appendix provides eight illuminating case studies of PD initiatives in diverse schools.