This evaluation report describes a central professional learning strategy that the California NGSS Early Implementers Initiative used to help teachers effectively transition to the Next Generation Science Standards (NGSS). The Initiative's approach to lesson study, called a Teaching Learning Collaborative (TLC), brings together teams of teachers…

Over the course of six years, a diverse group of school districts and charter management organizations in California ran a substantial experiment in implementing the Next Generation Science Standards (NGSS) in elementary and middle grades. WestEd led an extensive evaluation of that effort, the California K-8 NGSS Early Implementers Initiative,…