Fastställda av Kungliga Skolöverstyrelsen för läsåren 1955/59
The National Board of Education, which on 27 April and 18 June 1955 established subsequent timetables and main elements for experimental activities with a nine-year unitary school to apply for the academic years 1955/1958, later decided on 9 September 1957 to extend the validity period until the end of the academic year 1958/1959