This book reviews research in linguistics, psychology, reading and writing, and brings this work to bear on the problem of readable writing. The research supports the theory that two factors in text are crucial to its readable quality: psycholinguistic redundancy and cohesion. The book also reports the results of three empirical studies and a case study that further illustrates this theory. The findings have important theoretical and practical implications because they shed light on the nature of reading and writing processes from both linguistic and psychological perspectives, and suggest practical approaches to the production and comprehension of readable writing. The book also draws on research in second language acquisition and is pertinent to readable writing in both first and second languages.