This article presents a dialogue about personal construct psychology, radical constructivism, and social constructionism. The dialogue is based on a symposium conducted in July 2011 at the 19th International Congress on Personal Construct Psychology. Jay Efran, Sheila McNamee, and Bill Warren were the participants, with Jonathan Raskin as moderator. The dialogue addresses points of contact and divergence across these three theories, how these theories deal with the issue of relativism, and how theorists from these three perspectives might best “go on” together. Relevance: The paper covers the relationship between radical constructivism and personal construct psychology and social constructionism.