For teachers, the 'letting go' of control can be equally disorienting and it may seem that giving students such control depreciates teachers' skills and experience. Traditionally, teachers are used to being the center of student activity, controlling how, when and why students do what they do. Students have been expected to work in "lock-step" with the teacher orchestrating what students do to a very high degree. Teachers, in turn, rely on textbooks that allow little variation. Use of self-access center materials steer students way from the rigidity and "security" of this paradigm, causing teachers to lose their "all-powerful" and "all-knowing" position. This can cause problems integrating a self-access center due to political and institutional constraints.