In this chapter, the authors explore the opportunities for, and benefits of, the codification of content and student practice. For the detail of curriculum, the codification into booklets or some other format serves several crucial purposes. Booklets and other codification documents simplify everything and free teachers to concentrate on routines, modelling, questioning, and subject knowledge. The writing or editing of curriculum booklets or similar codification can in itself be powerful professional development for teachers. Once a department reaches a point of codification for all units for all years, it would be a mistake to think that their work is done. Mapping out the areas of knowledge, grouping components for meaning on a page or screen, is a valuable form of codification, making the implicit explicit and allowing deep thought and discussion. In many subjects, scholarship from the field of production is a meaningful inclusion in booklets or other codifications.