Particular individuals who might never consider dropping out if they were in a different high school might decide to drop out if they attended a school where many boys and girls did so.

The present structure of rewards in high schools produces a response on the part of an adolescent social system which effectively impedes the process of education.

The higher the social class of other students the higher any given student's achievement.

Schools are successful only insofar as they reduce the dependence of a child's opportunities upon his social origins.

In a high school, the norms act to hold down the achievements of those who are above average, so that the school's demands will be at a level easily maintained by the majority.

The results indicate that heterogeneity of race and heterogeneity of family educational background can increase the achievement of children from weak educational backgrounds with no adverse effect on children from strong educational backgrounds.

Children from a given family background, when put in schools of different social compositions, will achieve at quite different levels.