This book review summarizes Lorna M. Earl's book "Assessment As Learning". The book discusses how formative assessment can be used as a powerful tool for learning when used to understand student beliefs, inform classroom instruction, and encourage student reflection. It provides real-life examples and strategies for implementing formative assessment in various contexts. The book advocates shifting the focus from high-stakes testing to using ongoing assessments to optimize learning and help students develop and extend their knowledge. The reviewed summarizes each chapter's key points on using assessment to identify student beliefs, motivate learning, and help students make connections to extend their learning.