Provides the essential background for understanding and using the 40 research files compiled in the Housing Assistance Supply Experiment (HASE). The experiment investigated whether direct cash allowances were a feasible way of helping low-income households maintain decent housing. The eight program files contain client and administrative data collected over the period 1974-1979 from full-scale housing allowance programs carried out in Brown County, Wisconsin, and St. Joseph County, Indiana. The 32 survey files contain data collected in four annual cycles of field surveys conducted in each site to measure the program's effects on the local housing market and community. The surveys included interviews with the owners and occupants of a marketwide sample of properties, and field observations of their buildings and neighborhoods.