The document provides Delaware's plan for implementing the Next Generation Science Standards (NGSS). It outlines the vision, leadership team, research base, and action plans for communication, assessment, instructional practices, curricular resources, and infrastructure. The research base discusses the need for professional development in science education to actively engage teachers in investigating phenomena, build understanding of science content and pedagogy, and promote collaboration. Effective professional development incorporates sustained learning over time, focuses on student and teacher needs, and supports lifelong learning. Video analysis, collaborative sensemaking, and technology-enabled environments are recommended strategies for professional development during NGSS implementation.