CHOLOGY.) Vocational Psychology is concerned with the selection and guidance of individuals with respect to the vocation for which they are best fitted. Guidance and selection, to be adequately administered, require the analysis of the various occupations to determine the qualities that are needed for success in them, and the construction of measuring instruments to test for the presence of these qualities in the individual. The greatest progress has been made in the direction of finding the amount of intelligence that is required for various vocations, and in measuring the degree of intelligence that a person possesses. It is possible at present to estimate with some assurance the minimum of in telligence required for success in college work, for success in the professions, and for success in some of the skilled and unskilled trades. Satisfactory tests have also been devised for more highly specialized capacities, such as musical ability, motor skills and executive ability. The measurement of the traits of character and temperament which are recognized to play a vital part in success in life offers more serious difficulties than the measurement of the intellectual traits, and little can be done for practical guidance in these respects at present. In a somewhat similar state is the effort to measure interest, although some progress is being made through the simple listing of interests in specific situations, and then weighing them empirically according to their prognostic value for a given vocation. Vocational psychology should be credited with the demonstration of the inadequacy of many widely used vocational devices, such as the analysis of handwrit ing, physiognomy, interviews and letters of application (see VO