The present volume, like the previous editions of the Measurement of Adult Intelligence, centers around the theory, findings and applications of the author's Adult Intelligence Scales, but its scope as well as its content has been considerably extended. To a large degree it is a new book. Whatever has been retained from the older editions has been extensively rewritten, and five new chapters have been added. At the same time certain parts have been entirely omitted. The additions include chapters on the Factorial Composition of the W-B I and the WAIS, Changes in Intellectual Ability with Age, Sex Differences in Intelligence, Changes in Intelligence Consequent to Brain Damage and the Use of the W-B I and WAIS in Counseling and Guidance. No longer included in the volume is the manual of directions for the W-B I which constituted Part III of the earlier editions, and the chapter on the Need for an Adult Intelligence Scale.