Besides teachers and students, the most consistent presence in school science is the instructional materials. BSCS, in collaboration with the K-12 Alliance of WestEd, developed a process and set of tools to help teams of science teachers analyze instructional materials for compatibility with an inquiry-oriented approach to teaching science. This process, known as Analyzing Instructional Materials, or AIM, can help in the selection and subsequent implementation of instructional materials. This chapter introduces the philosophy and process of using AIM.