The relationship between academic tracking and exclusionary discipline actions has only been studied in a limited number of empirical studies. By placing students at the lower strata, schools deprive them of the educational opportunities, widening the educational opportunity gap in a process we define as "opportunity stratification."…

Whether intended by education policy (e.g., via school entrance examinations) or unintended (e.g., via social stratification), selection effects in education (who goes where, gets what, and how much) shape educational opportunities -- influencing the life chances of individuals and groups, and the structure of societies. However, within the…