The course investigates the Pruitt-Igoe Public Housing Complex in St. Louis, Missouri USA. A large literature implicates several factors in Pruitt-Igoe’s decline, which public authorities famously demolished in 1972. Often, this literature cites design and planning as contributory factors without specifying how or why in precise terms. Building on archival records and previous research, we analyze the ‘spatial archaeology’ of Pruitt-Igoe using space syntax. Our purpose is to better understand how design and planning contributed to its social malaise. It concludes: 1) provision of space (i.e. quantity) became a liability as declining occupancy generated a ‘broken interface’ between adults and children; and, 2) the pilotis of the residential towers mediated formal access and spatial distribution in a layout characterized by ‘intelligible dysfunction,’ which facilitated opportunity and escape for criminal activities. Both fed the perception and reality of social malaise at Pruitt-Igoe (2.5 hour course).