Explores what kinds of calculus-related insights seem to typify calculus-related reasoning. Introduces "qualitative calculus" in which learning is focused on synthesis. Discusses the resemblance and difference between traditional calculus and qualitative calculus, advantages of learning qualitative calculus, and how understanding qualitative calculus can support and link to the traditional rate-related calculus of slope, ratio and proportion, and curricular connections and implications. (Author/KHR)