If They Don't Test, Don't Hire Them
http://www.asktog.com/columns/037TestOrElse.html

Tognazzini, Bruce
Nielsen Norman Group
2000

Abstract:

The single best indicator as to the overall competence of an interaction design team is their plan for user testing. If you are presented with no plan or a sort of vague 'and we'll eventually do some user testing,' you may want to back off and look at other resources. If, on the other hand, you are given a proposal outlining repeated design and test cycles, you are dealing with people who know exactly what they are doing.