- Racially mixed elementary schools improved achievement for Blacks and Whites if non-Whites were a large minority (about 25%), but Black achievement was depressed if non-Whites were a small minority.
- The high school racial composition did not have much effect on test scores either way.
- The lesser impact of racial mix at the high school level, compared to elementary school, is consistent with other studies.
- In general, Blacks gain more than whites in schools that are 0-75 percent White. Whites gain more than Blacks in schools that are 76-90 percent White.
- Whites, like Blacks, improve most in schools that are 51-75 percent White. Their improvement seems less marked, however, if one estimates initial ability using the first grade verbal test rather than the nonverbal test.