Abstract

This study demonstrated that encountering children ages 18-23 months whose performance is not scorable by standard methods for either the Stanford Binet Intelligence Test or the Bayley Scales of Infant Development mental scale is a relatively frequent occurrence. However, the results of this study bring into question Sternlicht's (1965) suggestion that an 18-month basal level on the Stanford-Binet may be assumed, given success by a child on only one item at the two-year level. The study indicates that a child must succeed on at least two, or more conservatively, four items at the two-year level on the Stanford-Binet in order to assume an 18-month basal level.

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