The process of on-line recovery from errors in sentence comprehension is a lively focus of research activity in psycholinguistics. This volume offers chapters by experimental and theoretical psycholinguists who have been moving this research forward, sometimes in agreement with each other, sometimes developing opposing views. The experimental data and explanations presented here will interest linguists and psychologists, and all those concerned with how language is used, so rapidly and effectively, for communication. Language understanding is one of the foundational areas of cognitive science, and the research represented here may illuminate how the human mind is able to perform running repairs on its own computations. The material can be read with interest by graduate students and advanced undergraduates as well as practicing researchers.