Some of the new features of these significantly enhanced editions include: Chapter introductions provide a summary of required knowledge, encapsulating the Essential Knowledge of the AP curriculum framework (2015) and matched point for point. A Key Idea introduces each activity, providing a clear focus and "take-home" message for the student. New activities to support student-led inquiry and a larger number of activities involving data analysis and modeling. New case studies and required illustrative examples. New easy-to-use coding for weblinks, content and concept connections, and science practices: Science Practices are well supported through integrated activities in both volumes. Concept and Content Connections codes enable students to make important connections across the entire program. New content to support the 13 required practicals. Both volumes include content adjustments and updates in light of the latest (2015) review of the framework and in keeping with the dynamic nature of science. Review activities at the end of each chapter enable students to test their understanding and are ideal as formative assessment tasks. Synoptic activities suitable as summative assessments conclude each section of work.