First Published in 1987. During the last thirty years, Arthur Jensen’s brilliant contribution to knowledge has been well-known world-wide. From its early transmission, his work has not been without its critics. Naturally, criticisms persist, although his work continues to be frequently acknowledged with great admiration in the channels of psychology. With such prolific work, it would seem justified to consider the discrepancies, the omissions, together with the various interpretations which have been and are currently being highlighted. No theory or practice in modern psychology has been the object of more stringent attack than mental testing, and among the most severe criticisms is that of cultural bias.