Testers were instructed to enter these data prior to discussing their experiences with their testing partners. When a tester received a job offer, he or she was instructed to call the employer back within a few hours to refuse the offer. In the United States, it is common practice for employment application forms to request the names and telephone numbers of references such as former employers. In both studies conducted by The Urban Institute, testers supplied such names and numbers, but the numbers did not work. These rates suggest that employers generally perceived the testers to be credible, qualified job applicants.
Additional information is based on the author's personal knowledge.
However, in employment testing, it is unrealistic to assume that testers would not infer the subject of the study from the procedures they were following and the data they were asked to record. All four studies excluded positions with government or non-profit organizations.