Noting the lack of research comparing the Test of Nonverbal Intelligence (TONI) with other measures of intelligence, a study was conducted to ascertain concurrent validity. The TONI was compared to the Slosson Intelligence Test for Children and Adults (SIT) and the Wechsler Intelligence Scale for Children--Revised (WISC-R). Subjects, 43 males and 28 females ranging from 7 to 18 years of age, completed the TONI and either the SIT or the WISC-R. The resulting data were analyzed with both Pearson product-moment correlations and t-tests. It was found that the TONI has statistically significant high correlations with both the SIT and the WISC-R. The results indicated that the TONI is an appropriate instrument to use when a language free intelligence test is needed. (Author/HTH)