This document compares three options for handling an HR function: doing it in-house, using multiple vendors, or outsourcing to a single vendor HR company. Doing it in-house takes significant time but keeps costs low, while multiple vendors saves some time but leads to higher long term costs and lack of integration. Outsourcing to a single vendor HR company like a PEO provides experts to manage HR, reduces liability, and ensures lower long term costs through negotiated benefits and expertise, but the right partner must be selected.