The focus of this course is on the construction of modular theories of morpho-syntax and phonology via an examination of domain- formation mechanisms used in current theories, with a focus on Distributed Morphology, CVCV phonology, and the Prosodic Hierarchy. We will begin with an introduction to the architecture of DM and its view of the morpheme. We will then move to a discussion of the predictions made by, and problems for, DM when we take into account the phase-cyclic mechanism of locality/domain formation. This will lead us to a discussion of whether independent phonological cycles are needed to augment the morpho-syntactic cycle, and subsequently to whether additional representational tools are necessary to capture the different kinds of phonological domains that are targeted by phonological rules within a language.