Abstract
The predecessor to the Eysenck Personality Inventory (E.P.I.) (Eysenck and Eysenck, 1964) was the Maudsley Personality Inventory (Eysenck, 1959) which has won wide popularity, and evidence has been presented for its high retest reliability for a number of different populations and over periods of time ranging from 1–2½ years (Marley and Bartholomew, 1959; Knowles, 1960; Ojha, Kelvin and Lucas, 1966).

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