Korner concerns herself principally with the problem of the prediction of concrete behavior from projective test results. She points out that tests merely elicit behavior, that any conclusion derived from the test results is by way of inference, and that such inference from test data is bound not only by the extent of the interpreter's familiarity with psychodynamic principles but also by the limits of our present-day knowledge of such principles. Ego psychology has yet to spell out all the innumerable variables at work in the process of an individual's reality adaptation to a need, the interaction of these variables, and the mechanics of ego synthesis. Allowance for fate must also be made. Projective techniques indicate major potential modes of reaction and often only latent pathology; improved methods of assessment of defense from test results are required. It is therefore unrealistic for psychiatrists and presumptuous for psychologists to expect highly specific and accurate predictions based on the inferences from test results.