Abstract
The validity of some of the diagnostic procedures (1.1) commonly used as criteria for determining aptitude for motor vehicle driving (1.2) was examined (2.1). A factor analysis resulted in ten factors: although these cannot be regarded as "primary" traits, an interpretation is attempted (2.2). Considerations resulting from the small number of Ss (N- 91) would seem to make it advisable to consider the results as working hypotheses only which must be examined with a larger group of subjects in a control investigation which has already been planned (3).