This table shows the development of the number of schools, classes, pupils and teachers at mid-tier secondary schools [Mittelschulen], schools offering a more modern and job-market oriented secondary education above the level of the basic Volksschule and below that of the Gymnasium, from 1911 to 1939. The number of students in secondary schools decreased significantly overall between 1911 and 1939. The number of teachers and schools also decreased.

After the end of the First World War, the school system in the Weimar Republic was comprehensively reformed. With the “Weimar School Compromise” in 1919 and the Primary School Act of 1920, a school system consisting of a common four-year elementary school and a subsequent division into a three-tier school system was introduced. Secondary schools, which had already been established in the nineteenth century, were upgraded and recognized as a separate type of school. However, the global economic crisis of 1929 meant that the resources available for education became scarcer. This also had an impact on secondary schools.