The screening survey administered in Brown County, Wisconsin, as part of the Housing Assistance Supply Experiment, provided data on a large sample of residential properties for stratification, and on housing characteristics needed to set program standards. The survey completion rate was 86 percent, which meant 8,646 field-complete interviews. The audit report evaluated the reliability of the data and identified problems in survey instruments, field procedures, and data processing that may be correctable in later surveys. Nonresponse bias was not considered significant except for certain questions on household income, but audit procedures identified 2,182 out of 427,414 responses as implausible. Sample validity was tested by comparing population estimates based on survey records with corresponding figures from the 1970 Census of Housing. Relationships among variables of household and housing unit characteristics received preliminary analysis pending more detailed data.