ABSTRACT
WE must now turn to a consideration of positive validity, i.e. evidence that questionnaire responses of subjects to the M.P.I, do in fact correlate with reasonable criteria of their outside behaviour. One very fundamental method that is obviously relevant in this context is the method of nominated groups, i.e. the investigation of agreement between questionnaire response and independent ratings by outside observers. The first study to be described here was carried out by S. B. G. Eysenck (1962).
