We are introducing a new term, called archtheory. An archtheory is a proposition about how to fit together unification metatheories with supporting evidence. When doing archdisciplinary comparative analysis, universal congruencies or archetypal universal patterns that hold across unification metatheories are found, called arches. Arches are the means in which unification metatheories are fitted together, and the basis in which archtheories are made. Arches are good candidates for natural laws.