Including all children in large-scale educational studies is a pressing concern. Omitting certain types of children from studies can lead to skewed findings that promote inaccuracies about learning levels or educational quality. Increasingly, assessments are a method for investigating the quality of education systems, but national assessments are…

An attempt is made here to trace the development of Coleman's research reports and public statements. Several critical evaluations of this work are then reviewed, including one the authors have carried out. It is suggested the overall research suggests six generalizations: there has been an enormous, long term trend of whites leaving the central…