Better planning does not imply the loss of flexibility. Some teachers regularly include more questions in the packets than their students will do in a lesson, so they can jump ahead to harder problems or double back for more review, depending on students' progress. Others include section levels of mild, medium, and spicy; that way, students can adapt by adding more mild or spicy to their diets as a group or as individuals. Thus, students speed can speed ahead or double back on their own. Teachers in bed challenge or deep thinking questions in their packets. Individual students can try them on their own, or if things are going well, a teacher can use them as a class activity.