This volume investigates interface interpretation within Phase Theory, the current stage of syntactic theorizing within the ´;Minimalist Program´, the generative research enterprise instigated by Noam Chomsky over 15 years ago. The collection brings together scholars who address architectural, conceptual, and interpretive issues in the grammar. In their investigations of the interpretive interfaces, Logical Form and Phonetic Form, the chapters provide novel analyses for both new and well-known facts, address theoretical issues for Phase Theory, and contribute insights from phonology and semantics.