The Bossche School was a traditionalist movement in Dutch architecture which was strongly based on numerical relationships. It arose from the Delft School and was influential primarily on the design of Catholic churches. The name of the movement came from the three-year Course in Ecclesiastical Architecture which was offered from 1946 to 1973 in the Kruithuis in 's-Hertogenbosch. The training was intended to guide architects during the post-war reconstruction of churches. The leaders were Dom Hans van der Laan, his brother Nico van der Laan and C. Pouderoyen.