We measure a man's height in centimeters or inches. Pounds and ounces or grams and centigrams offer us exact standards of measuring his weight. But there are no absolute standards for measuring the man himself, and probably there never can be. Human values, therefore, can be standardized only relatively. By the study of large groups we can, however, ascertain approximately the average or normal. In this way, physical standards have been set up as to pulse rate, temperature, respiration, etc. Chemical analysis determines norms of blood composition, and microscopic investigation determines the average number of blood corpuscles per cubic centimeter. The Binet-Simon mental tests are based upon certain approximate averages of intelligence and mental development established in the same way. The Münsterberg associated-word test of intelligence and other psychological experiments are among the efforts made to establish such standards. These are valuable as far as they go and probably yield all the information that their originators claim for them, which, unfortunately, is not a great deal. By time and motion studies, we are enabled to set up standards of efficiency that work out well in practice. All these, however, still leave us in the dark as to the man himself--his honesty, his loyalty, his highest and best values. ELEMENTS OF THE VOCATIONAL PROBLEM But, granted for the moment that we could devise and successfully apply exact and accurate standards of measurement for human beings, our work would be only partially done. Any mechanic knows that it is a sad waste of time and pains to standardize tenons, with micrometer and emery paper, to a thousandth of an inch, so long as the mortises are left unstandardized. A valuable man makes an unusual record on the staff of some employer. Other employers immediately begin to lay plans to entice him away. Transferred to another organization, he may prove mediocre, or even undesirable, in his services. Hiring "stars" away from other employers has proved disastrous so many times that the practice is no longer common. Many a flourishing and fruitful tree has been transplanted, only to wither and die--a tragedy involving the tree itself and both orchards. Measured by every known standard, a man thus enticed away may be close to 100 per cent efficient, but the man is only one ingredient in the compound from which results are expected. To know and to rate his aptitudes, abilities, personality, and possibilities is of the highest importance, but these cannot be rated except in relation to his work and to his environment. These are the other two ingredients in the compound. It is quite obvious that all standards for judging men--and for self-analysis--must vary with relation to the work they are to do and the environment in which they are placed.