Summary.The Wechsler Preschool and Primary Scale of Intelligence, modified in certain respects in order to render it suitable for use with a British child population, was administered to a random sample (n=60) of 5 1/2‐year‐old children in Nottingham. Results are compared with those obtained by Yuleet al(1969) and it is noted that except for means and standard deviations they are closely similar. Though the studies agree as to the absence of significant sex differences it is suggested in this paper that there may well be a bias in favour of boys throughout the Sc