The eight Science and Engineering Practices listed in the Framework for K-12 Science Education and incorporated into the Next Generation Science Standards and the eight Mathematical Practices in the Common Core State Standards describe a set of intellectual tools for engaging in and more fully understanding science, engineering and mathematics. The Practices constitute much of what scientists, engineers and mathematicians “do” in the course of carrying out their disciplines. As such, the Practices should be central to what students engage in as they learn in a mathematics or science classroom.