Neither OFCCP nor the regulations it enforces prescribe a certain minimum number of candidates to be interviewed for each position, or a minimum number of applicants, for that matter. That said, if you are a federal contractor, you are required to undertake outreach to certain demographic groups - minorities, women, veterans, and individuals with disabilities - depending on your coverage under EO 11246, VEVRAA, and Sec. 503, to meet your affirmative action goals. When there is a 1:1 applicant to hire ratio for a position, it tends to raise a red flag and begs the question - was outreach undertaken? Was the position listed? What is the actual applicant source pool? Situations where there is a 1:1 ratio can certainly happen. Federal contractor employers just need to make sure that they can adequately explain and support how they came about.