Social science fledglings can improve their theorizing by focusing on three questions: Theory of what?, Why should we care?, and What merit in your explanation? This suite of questions takes the spine of theory to be explanation. Explanation has a counterpart in the thing to be explained, the explanandum. The three questions have been deployed in criticizing the tendency in economics to pass off mere model-building as theorizing. I summarize that deployment and then offer the three questions as means to discipline one’s theorizing.