other times their constructive theologies show originality coupled with continuity. Among themselves they also find nuances and disagreements; thus the need for dialogue and debate with each other. The answer to the question “Whither Trinity?” has over the centuries been contingent on the threeness-oneness problem and on defining more precisely key terms such as one, three, person/prosōpon/persona, and essence/nature/ substance/ousia. Most of the essays in this part discuss these issues. Part of