N = 1 string duality

We discuss duality between type IIA string theory, eleven-dimensional supergravity, and heterotic string theory in four spacetime dimensions with N = 1 supersymmetry. We find theories whose infrared limit is trivial at enhanced symmetry points as well as theories with N = 1 supersymmetry but the field content of N = 4 theories which flow to the N = 4 fixed line in the infrared.