The following chapters present, in organized arrangement, part of the material included in a series of lectures on vocational and industrial psychology. Only those topics are considered which bear more or less directly on the appraisal of human character, for definite and usually for practical purposes. The book does not undertake to outline plans for vocational guidance, nor to prescribe specific procedures in personnel work. It offers, instead, a general and nontechnical survey of the principal methods relied on in judging human traits.<br><br>Traditional methods are criticized, and effort is made to suggest improvement in the technic of applying these methods or in interpreting the results derived from their use. The present status of the methods of mental measurement in various fields is surveyed, in the endeavor to communicate a general understanding of the principals underlying these methods.