This edited volume contains a representative sample of papers presented at the 7th meeting of the Generative Approaches to Language Acquisition - North America (GALANA-7) conference. The book features three streams of research (Variation in Input, First Language Acquisition, and Second Language Acquisition), each of which investigates the nature of language acquisition from the generative perspective. A unique feature of the GALANA-7 conference, and of this volume, is the bringing together of research on generative language acquisition and research on the role that cross-dialectal input variation plays in acquisition. This volume should be of interest to scholars and students of first language acquisition, second language acquisition, and input variation.