This paper reports the factor structure of a 37-item personality quest
ionnaire intended to be predictive of driving performance in elderly p
ersons. Subjects were 191 persons 63 years of age or older, about half
of whom also were given perceptual/cognitive tasks and drove on a clo
sed driving course. Although the personality questionnaire did not pre
dict driving skill, the factor structure of the questionnaire is of in
terest. Of several factor analyses, the most satisfactory was a 2-fact
or solution. We interpreted the approximately orthogonal factors as me
asuring what we labeled Competence and Emotionality.