The traditional focus of the Papers in Laboratory Phology series has been on the relationship of phology to phonetics. The present volume expands this domain in setting two new themes: language acquisition and lexical representation. Contributors tackle the central problem of what constitutes a possible word in generative phology, employing contemporary approaches such as Optimality Theory, connectionism, and stochastic grammars. Several papers integrate the issues of lexical representation and language acquisition by undertaking to explain the organization of the adult phological system as the end product of the acquisition process. Others explore the role of sequential frequency in the lexicon and the development of fine temporal control in production in the emergence of phological segments and features. Papers in Laboratory Phology V: Acquisition and the Lexicon will thus be of interest to a wide range of researchers in phonetics, phology, psycholinguistics, cognitive science, and the study of speech and communication disorders.