This article analyses reforms addressing and affecting the curriculum and organisation of Swedish upper secondary education over 40 years, up to an initiative by the present non-socialist government. The aim is to analyse the current reform of upper secondary education and relate it to previous reforms during a 40-year period in terms of continuity and breaks, mainly with regard to major functions of the reforms and the structuring and control of educational contents. Aiming to create a sharper division of students into three separate streams (academic and vocational education, and apprenticeship training), the reform constitutes a major break with the previously dominant trend towards greater integration. It is argued that it will result in a restriction and reformulation of the knowledge which is regarded as desirable. Similar moves are evident in relation to teacher education, which, if enacted, would involve moving from a model of high flexibility and a common core of knowledge to substantially stronger divisions between contents and programmes.