"In the field of personality four questionnaire factors stand out: extraversion, neuroticism, psychoticism and obsessional traits. Paul KLINE, 1992, 'The factor structure in the fields of personality and ability'. In A.Gale & M.W.Eysenck, Handbook of Individual Differences: Biological Perspectives. Chichester : Wiley DePublisher. "A....weakness often noted in psychiatric nosology is the reliability of diagnoses: different psychiatrists very frequently apply different diagnostic labels to a given patient. It is frequently claimed that the arrival of DSM-III, the Diagnostic and Statistical Manual of Mental Diseases, published by the American Psychiatric Association, has overcome this difficulty, and that all is now plain sailing. [Kirk & Kutchins (1992, The Selling of DSM) have] shown clearly that these claims, often made by official sources, are quite unjustified; paturient montes nascetur ridiculus mus! (The mountains will be in labour, to produce a ridiculous little mouse! HORACE.)"