The state textbook adoption process provides for the continuous review and purchase of new instructional materials. Adoption states choose at the state level what textbooks can be used by all school districts. This process was established to provide quality materials to school at a guarenteed price and to provide equal access to those materials for all student in adoption states. Each adoption state has their own set of rules and procedures that govern the process, but the end result is the same: Quality textbooks that meet their state curriculum.