The mission of Professional Examination Service (PES), a nonprofit corporation, is to promote and protect the public welfare by articulating and demonstrating the value of credentialing and continuing competency assurance. This mission is founded upon our conviction that credentialing benefits both the public and the professions and occupations choosing to engage in this process. PES meets its mission by providing services and funding selected public service initiatives that impact the quality of the credentialing and continuing-competency assurance process.

Superb credentialing systems are founded on solid relationships with clients. We consider our clients not as passive recipients of a "product line" but rather as partners in a shared endeavor. Thus, we take great care to build and maintain robust, high-quality customer service and information systems that enable us to provide personal, responsive service and consultation.

In striving to meet our mission, we are accountable to clients, to those who participate in the testing process, to society as a whole, to the measurement profession, to the staff of PES, and, finally, to our Board of Directors. We view our work as a shared endeavor, to be guided by our mutual interest in setting and measuring standards of competent, ethical professional and occupational practice.