The document discusses how to adapt textbooks for language teaching. It notes that textbooks alone do not teach language, but are tools that can be adapted. Teachers should reflect on their approach and adapt materials based on learner needs and the teaching context. Textbooks provide structure but also have limitations, so adaptation is important. The document provides guidance on how to adapt materials at different levels, from individual activities to entire units or syllabi. It also outlines a cycle of ongoing assessment and adaptation when using textbooks.