Staff augmentation and recruitment companies typically mix existing vetted pools with newly sourced candidates. The exact split depends on how mature their database and nurturing processes are. New recruiting brings in people actively interested in interviewing but still needing full vetting, while existing talent pools can move faster if candidates are already assessed and just need interest reconfirmed. A balanced approach typically operates close to a 50/50 split between existing pools and new recruiting, ensuring both speed and quality in candidate presentation.