A team of six pen testers were assembled and told to try and penetrate the targeted company’s headquarters. Their instructions were not just to attempt to get inside, but once inside see just how far they could go with a prepared list of target points. One guy, posing as a consultant from another company that the target company does business with, got in by walking up to the front desk and telling the person there he needed some help. The other three pen testers, walking around the building outside, found a way in through an open garage door in the back of the building, and quickly ducked inside and got upstairs.”]
Source: https://www.cuinfosecurity.com/blogs/anatomy-penetration-test-p-44