In an attempt to locate possible antecedents for racial differences in science achievement, measures of math and reading achievement, causal attribution, attitude toward school success, and in-class behavior were acquired from students in desegregated science classrooms. Comparisons were made among students differing in race and sex on mean performance and degree of relationship among variables. Significant group differences were limited to mean achievement test scores and science grades. Achievement scores were significantly related to grades, but classroom behaviors also accounted for a significant and unique portion of the variance. There were no significant relationships between behaviors and other student measures. Teacher ratings of effort, ability, course difficulty, and environment were also acquired. Teachers rated white students as smarter but believed that black girls exerted the greatest effort and black boys, the least. As a secondary interest, number and type of student interactions were recorded. Few hostile interracial encounters were observed, and interactions were predominately within race.