The chapters in this volume are the result of a series of Cognitive Sciences Workshops held at McGill University. Each workshop was organized around a different theme and each of these topics is represented in the volume: language acquisition and development; text and text processing; computer chess; grammars, parsers, and language comprehension; scientific reasoning and problem solving; language and the brain; and semantics. The topics are approached from the perspectives of linguistics, psychology, philosophy, computer science, and neurology.