Apologia Science courses are written from a Biblical worldview with the homeschool in mind. At the elementary level, courses follow a Charlotte Mason-inspired methodology, with lessons organized around narration, notebooking exercises and hands-on activities or projects. Children at different ages can use these together, learning at their own level. Each course is designed to be teacher-student interactive, so teacher involvement is fairly high at this level. At the junior high and high school levels, science courses are more traditional in nature, with the textbook written to the student. Teacher involvement time at this level is much less than at the elementary level. Textbooks contain student reading, lab instructions, "On Your Own" questions and Study Guide questions. A Solutions Manual provides the answers to these and the test questions. Lab kits are available separately for both the elementary and upper-level science courses which include most of the harder to find items you will need.