Mr. Schafer is not a neophyte to psychological literature. His name appeared first in 1944 as collaborator on David Rapaport's Manual of Diagnostic Psychological Testing. A few years later, Rapaport published his two volumes of Psychological Diagnostic Testing in which Mr. Schafer's name also appeared as one of the chief collaborators. One might well ask why there is another publication on the same topic so thoroughly covered in these two volumes. The answer is obvious. Rapaport's two books contain a great deal of fine psychological reasoning and the establishment of psychological rationales for test factors. He uses many statistical data and methods of validation. This renders his books a bit unwieldy. Another