The strategies associated with the “Content” aspect of the framework help keep us focused on the question “Why am I doing this?” Clearly, we need to know and be able to articulate why we are addressing particular content in our lessons and how that content is related to the important learning goals established for students. In this section, you learn how to clarify what students should understand about science concepts, as the first step in a new method for planning effective lessons; practice identifying rigorous, appropriate, worthwhile content; and participate in a reflective process to check your units and lessons to make sure they are focused on important learning goals.