The essays in this volume address a core question regarding the structure of linguistic systems: how much access do the grammatical components - syntax, morphology and phonology - have to each other? The book's fifteen essays make a powerful argument in favor of a particular view of the interaction of these various components, shedding light on the nature of locality domains for allomorph selection, the morphosyntactic properties of the targets of phonological exponence, and adjudicating between competing theories of morphosyntaxphonology interaction. These words incorporate insights from recent theoretical developments such as Optimality Theory and Distributed Morphology, and insights made available to us by contemporary empirical methodologies, including field work and experimental and corpus-based quantitative work.