The Science 4 Teacher s Edition contains 116 lessons grouped in five units. Each unit consists of two or three interrelated chapters. Most lessons include additional background information, cross-curricular links, and scientific activities. Information for the teacher includes suggestions for teaching the material as a three-quarter year program or as a half-year program. The Teacher s Edition also includes useful information about science process skills, the management of activities, and grading. Reproducible pages, a materials list, rubrics for assessing Activity and Explorations lessons, and the Science 4 alignment with national standards are located in the back of the Teacher s Edition. The Teacher s Toolkit CD is located inside the back cover of the Teacher s Edition. It includes quizzes, quiz answers, rubrics, a copy of each of the Teacher s Edition reproducible pages in black and white and color, and useful information about science fairs, all in a printer-friendly format."