Includes bibliographical references (pages 547-626) and indexes.

Introduction / Ian Roberts -- The argument from the poverty of the stimulus / Howard Lasnik, Jeffrey L. Lidz -- Learnability / Janet Fodor, William Sakas -- First language acquisition / Maria-Teresa Guasti -- The role of universal grammar in non-native language acquisition / Bonnie Schwartz, Rex Sprouse -- Principles and parameters of universal grammar / C.-T. James Huang, Ian Roberts -- Linguistic typology / Anders Holmberg -- Parameter theory and parametric comparison / Cristina Guardiano, Giuseppe Longobardi -- A null theory of creole formation based on universal grammar / Enoch Aboh, Michel deGraff -- Language change / Eric Fuss -- Universal grammar and philosophy of mind / Wolfram Hinzen -- Language pathology / Ianthi Tsimpli, Maria Kambanaros, Kleanthes Grohmann -- The syntax of sign language and universal grammar / Carlo Cecchetto -- Looking for UG in animals: A case study in phonology / Bridget D. Samuels, Marc Hauser, Cedric Boeckx -- Universal grammar and philosophy of language / Peter Ludlow -- On the history of universal grammar / James McGilvray -- The concept of explanatory adequacy / Luigi Rizzi -- Third-factor explanations and Universal Grammar / Terje Lohndal, Juan Uriagereka -- Formal and functional explanation / Frederick J. Newmeyer -- Phonology in universal grammar / Brett Miller, Neil Myler, Bert Vaux -- Semantics in universal grammar / George Tsoulas.