NSDC Executive Director Stephanie Hirsh and Deputy Executive Director Joellen Killion outline eight principles to guide professional learning during the next era. If professional development decision makers adopt these principles, the authors believe they will contribute to ensuring that professional learning will improve leading, teaching, and learning. This book helps readers understand what qualifies as effective professional learning, enables them to believe that this kind of professional learning is possible to achieve, and provides a blueprint that enables thought leaders, researchers, and practitioners to join together in this crucial work.