Not since the 2011 release of A Framework for K-12 Science Education has a document held such promise and significance for the science education community as does the Next Generation Science Standards. The key to unlocking the full potential of the NGSS is a deep understanding of the interrelationship of its core ideas, scientific and engineering practices, and crosscutting concepts. This brief and easy-to-use Reader's Guide offers teachers, principals, district and state administrators-anyone with a vested interest in improving the quality of science education-the tools they need to fully abs