views habits of mind as ways of thinking, that when used habitually, can lead to successful learning of algebra. He stresses the development of three algebraic habits of mind: (a) doing/undoing which involves reversing mathematical processes; (b) building rules to represent functions which involves pattern-recognition and generalization; and (c) abstracting from computation which involves thinking about computations structurally without being tied to specific numbers, such as recognizing the equivalence of 5% of 7000 and 7% of 5000. He and his colleagues later developed a four-module toolkit for educators to work with teachers to learn how to foster these algebraic habits of mind in their classrooms (see Driscoll et al., 2001). Subsequently in Fostering Geometric Thinking: A guide for teachers grades 5-10, Driscoll, DiMatteo, Nikula, and Egan (2007) promote four geometric habits of mind: (a) reasoning with relationships, (b) generalizing geometric ideas, (c) investigating invariants, and (d) sustaining reasoned exploration by trying different approaches and stepping back to reflect while solving a problem. The Fostering Geometric Thinking Toolkit was published a year later