The Menninger School of Psychiatry, organized in 1945, became the largest training center for psychiatry in this country. Early in its history, the research staff of the Menninger Foundation decided to take advantage of an opportunity to study procedures for selecting residents better to predetermine their fitness for psychiatric training. The last four of ten years have been devoted to analyzing the results of the research covering the first six years. The authors of these two volumes were in charge of the research study about