This study presents results of confirmatory factor analyses of the recently published Fourth Edition of the Stanford-Binet Intelligence Scale. Four possible models of the scale's factor structure were tested with confirmatory factor analysis via LISREL at five age levels and for the standardization sample as a whole. Results of these analyses show that although the four-factor model presented by the scale's authors fits the general standardization data fairly well, it did not fit similarly well with data from several age groups. Overall, however, models based on the authors' theoretical structure were usually significantly better fitting to empirical data than were models with fewer factors. Results are discussed in terms of their implications for interpretation and use of the Stanford-Binet, Fourth Edition with young children.Thorndike, Hagen, and Sattler (1986) recently have published a major revision of the well-known Stanford-Binet Intelligence Scale. With test batteries like the Stanford-Binet, exploratory factor analysis often provides information useful in interpreting scores derived from them. Until recently, however, the age-level construction of the Stanford-Binet did not allow investigation of its underlying ability structure via exploratory factor analysis. The new edition of the Binet, its fourth (SB-IV), provides standardized scores for each of the measures' subtests so that their intercorrelations can be calculated. The resulting correlation matrix then can be studied through factor analysis.Just such an analysis is reported by Reynolds, Kamphaus, and Rosenthal (1987). Through traditional principal components and principal factors solutions, they found most frequently either a one-or two-factor structure in the Binet at the various age levels presented in the Binet's Technical manual (Thorndike et al., 1986). Results presented by Reynolds et al. provided little support for the model of cognitive abilities that underlies the new Binet. They report that the number of factors obtained varied across age levels and ranged from one to three.Reynolds et al. also observe that the meaning of the factors obtained is unclear and also may vary across age levels. Because the division of the Binet's scores into four subdomains is based on the notion that each reflects a distinct ability domain, the failure to find such factors in exploratory analyses calls the-overall organization of the scale into question. As Reynolds et al. conclude, &dquo;The previously cited results indicate that the multiple scale division of the Stanford-Binet, Fourth Edition, is illusory&dquo; (1987, p. 16). The sort of exploratory factor analysis presented by Reynolds et al., however, does not allow for tests of alternate factor models for the scale. A variant of factor