The General Expansion Plan (AUP) was developed in the 1930s because Amsterdam desperately needed to expand. An urban expansion with the allure of the ring of canals, that was the ambition behind the 1934 AUP. This did not mean a literal copy of monumental street walls along curved waterways, but a new city in which everyone - socially equal and surrounded by sufficient space, greenery and light - could further develop themselves. The solution was found in a series of new garden cities. The realization of the plan led to a doubling of the city's size from 1949. In an astonishingly short period of ten years, 50,000 houses were erected around Amsterdam in districts such as Bos en Lommer, Watergraafsmeer, Slotermeer, Geuzenveld, Osdorp and Buitenveldert. How did Amsterdam organize this mega-project, which (foreign) cities served as examples? What were the recurring themes and problems?