The construct stability of the Infant Form of the Cognitive Abilities Scale-Second Edition (CAS-2) was examined with 54 children who were assessed when they were between 3 and 23 months old. They were assessed again with the Preschool Form of CAS-2 when they were 2- or 3-year-olds. The two forms have no overlapping items and employ different formats. The correlation for children assessed initially when less than 1 year of age was .28 (.46 corrected for restricted range). For those assessed initially at 12 to 23 months, a correlation of .65 (.76 corrected) was obtained. Results for the majority of individuals remained stable over time. Implications for practice and suggestions for future research are discussed.
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