ABSTRACT
IT is interesting that throughout the last dozen or so years the Guilford, Cattell and Eysenck questionnaires have run their separate way without any investigation being devoted to a comparative study of their similarities and differences. In view of the fact that it now seems established that all three sets of questionnaires give rise to higher-order extraversion and neuroticism factors, it seemed desirable to carry out a fairly comprehensive study to analyse the precise relationships between the three sets of questionnaires. Such an analysis of course can be done at two levels. In the first place it is possible to group the questions within each questionnaire into sets according to the primary factors postulated by each of three authors on the basis of their own factorial analyses. These scales can then be inter-correlated and factorial analyses carried out on the scales. This roughly is what has been done in this section. In the second place it is possible to intercorrelate the actual items in the three sets of questionnaires, to factor analyse these and to see to what extent the factors which emerge are in fact similar to or identical with those postulated by the authors concerned. This is essentially what has been done in the subsequent sections of this part.
