Apprenticeship training has been known in Denmark since the Middle Ages. Along with the breakthrough of industrialization at the end of the 19th century, a dual system evolved with statutory provisions concerning the schooling and training of apprentices in trades and commerce (The Apprenticeship Act of 1889). The Apprenticeship Act of 1956 introduced the education of apprentices at vocational colleges during daytime - typically one day per week - instead of the previous evening or spare-time classes. Subsequent reforms have further strengthened the role of vocational colleges, and in this way, they have ensured broadness and diversity in educational qualifications.
Throughout the 1960s and 1970s, the education of apprentices at vocational colleges gradually took the form of longer periods of block release from training in the workplace.
