This edited collection contains 34 papers originally presented at the Generative Approaches to Language Acquisition (GALA) conference in 2013, held in Oldenburg, Germany. It represents theoretically guided, high quality work, and provides impressive insights into state-of-the-art research in the fields of first and second language acquisition and developmental impairments. The studies brought together here cover a wide variety of different (mainly European) languages, focusing on the areas of phonology, morpho-syntax, semantics, pragmatics, and their interfaces. Since their first publication, the proceedings of GALA have become an invaluable reference for cutting-edge research in First and Second Language Acquisition and its impairments – and this volume continues that tradition.