The "New Natural Law" Theory (NNL) of Grisez, Finnis, Boyle, and their collaborators offers a distinctive account of intentional action, which underlies a moral theory that aims to justify many aspects of traditional morality and Catholic doctrine. In fact, we show that the NNL is committed to premises that entail the permissibility of many actions that are irreconcilable with traditional morality and Catholic doctrine, such as elective abortions. These consequences follow principally from the NNL's planning theory of intention coupled with an implicitly Cartesian conception of human behavior, in which behavior chosen by an agent has no intrinsic "intentionalness" apart from what he confers upon it as part of his plan. Pace the NNL collaborators, we sketch an alternative hylomorphic conception of intentional action that avoids untoward moral implications by grounding human agency in the exercise of basic powers that are either essential to human nature or acquired through participation in social practices.
