Eysenck evolved four personality inventories that measure his superfactors. The first, the Maudsley Personality Inventory, or MPI (Eysenck, 1959), assessed only E and N and yielded some correlation between these two factors. For this reason, Eysenck developed another test, the Eysenck Personality Inventory, or EPI. The EPI contains a lie (L) scale to detect faking, but more importantly, it measures extraversión and neu-roticism independently, with a near zero correlation between E and N (H. J. Eysenck & B. G. Eysenck, 1964, 1968). The Eysenck Personality Inventory was extended to children 7 to 16 years of age by Sybil B. G. Eysenck (1965), who developed the Junior EPI.
The EPI was still a two-factor inventory, so consequently Hans Eysenck and Sybil Eysenck (1975) published a third personality test, namely the Eysenck Personality Questionnaire (EPQ), which included a psychoticism (P) scale. The EPQ, which has both an adult and a junior version, is a revision of the still-published EPI. Subsequent criticisms of the P scale led to yet another revision, the Eysenck Personality Questionnaire-Revised (H. J. Eysenck & S. B. G. Eysenck, 1993).
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