Excellent question! There is no requirement to interview or phone screen all qualified candidates. There are several "data management techniques" that are acceptable, including using batches of 20. The key is to ensure that the method selected is "facially neutral" and does not result in disparate impact.
You can use this OFCCP audit checklist to ensure you're doing what is required to maintain OFCCP's regulations including VEVRAA, Section 503, and EO 11246. Or request a demo to streamline your compliance and recruiting efforts.