Unity and the Frege-Geach problem

The problem of the unity of the proposition asks what binds together the constituents of a proposition into a fully formed proposition that provides truth conditions for the assertoric sentence that expresses it, rather than merely a set of objects. Hanks' solution is to reject the traditional distinction between content and force. If his theory is successful, then there is a plausible extension of it that readily solves the Frege-Geach problem for normative propositions. Unfortunately Hanks' theory isn't successful, but it does point to significant connections between expressivism, unity, and embedding.