These exercises are organized in order of the sections of C&C2 which they are designed to accompany. For each of them, recommended readings from C&C2 are shown--although other readings from the same book or from other sources could also be used. In-class exercises are normally designed to be used in a small-group setting, as described in Challenge 4. But in most cases, a minor re-wording of the instructions to students could convert an in-class exercise into a homework assignment, and vice-versa.