The validity of the Bureau of Business In-Basket for measuring the ability to perform the job of an administrative officer was examined. Factors derived from the in-basket test were compared to biographical data, interests, personality characteristics, and cognitive ability. Scores on the Strong Vocational Interest Blank and the Thurstone Temperament Schedule were considered. Factor analysis was based on data from 335 senior public administrators; full data were obtained for a group of 115 federal employees. The findings contributed to the validity of the simulation in that they revealed a certain amount of consistency between in-basket performance and other variables. Paper presented at APA, Los Angeles, September 1964.