Sorting or mixing? Multi-track and single-track schools and social inequalities in a differentiated educational system

In the Dutch stratified secondary educational system, schools vary in how many tracks are offered. While the tendency in the Netherlands is for schools to become smaller, a relevant policy question is whether multi-track school settings promote equality of educational opportunity. Comparing single-track schools at the pre-university and pre-vocational levels with multi-track schools offering the same exams, and using relative geographical distance as an instrument of school choice, the analyses showed that single-track pre-university schools enhance the probability of obtaining a pre-university diploma without delay, but more strongly so for students from disadvantaged backgrounds (who have a lower chance of going to such schools). The single-track pre-vocational schools were associated with a lower likelihood of achieving a diploma at a level higher than pre-vocational education. Multi-track schools within a varied system will not automatically enhance equal opportunities, as middle-class children will also benefit from the additional options that multi-track schools provide.