Jack Hawkins has long been a trail-blazer in the attempt to reconcile the results of formal and functional linguistics. Efficiency and Complexity in Grammars charts new territory in this domain. The book argues persuasively that a small number of performance-based principles combine to account for many grammatical constraints proposed by formal linguists and also explain the origins of numerous typological generalizations discovered by functionalists. Frederick J. Newmeyer, University of Washington Efficiency and Complexity in Grammars is a landmark work, setting a new standard in the study of the relationship between linguistic competence and performance. Tom Wasow, Stanford University Hawkins argues that grammars are profoundly affected by the way humans process language. He develops a simple but elegant theory of performance and grammar by drawing on concepts and data from generative grammar, linguistic typology, experimental psycholinguistics and historical linguistics. In so doing, he also makes a laudable attempt to bridge the schism between the two research traditions in linguistics, the formal and the functional. Efficiency and Complexity in Grammars is a major contribution with far-reaching consequences and implications for many of the fundamental issues in linguistic theory. This is a tremendous piece of scholarship that no linguist can afford to neglect. Jae Jung Song, University of Otago, New Zealand