Adopting modal logic the doctrine of the primacy of Christ is defined and defended in relation to the Thomistic – Scotistic debates over the primary and efficient causes of the incarnation. This leads to a defence of the Scotistic thesis and a reserved affirmation for the Scotistic hypothesis that there would have been an incarnation irrespective of the fall. This hypothesis is tested by reference to the work of four recent theologians, Thomas Weinandy O.F.M. cap., Karl Barth, J¨urgen Moltmann, and (...) Thomas Torrance. Finally, a sketch describ-ng another possible-world incarnation that builds upon the Scotistic hypothesis is provided. (shrink)