S
ummary
.
Two different approaches are used to analyse the data, given in the manual, on the usefulness of the Bristol Social Adjustment Guides as predictors of delinquency. The two methods each show that the predictive efficiency in terms of the ratio of valid positives to false positives is no greater than a quarter of that claimed in the manual and may be even less. It is suggested, therefore, that the use of the guides for this purpose be discontinued.