By exploiting an extensive pilot scheme that preceded an educational reform, this paper evaluates the effects of introducing a more comprehensive upper secondary school system in Sweden. The reform reduced the differences between academic and vocational tracks through prolonging and increasing the academic content of the latter. As a result, all vocational students became eligible for university studies. The results suggest that the policy change increased the amount of upper secondary schooling obtained among vocational students, but did not affect enrollment in university studies or students' earnings later in life. (Contains 9 tables, 3 figures and 27 footnotes.)