Welcome to the homepage of the National Center for Credibility Assessment (NCCA). For more than 60 years NCCA and its predecessor organizations have served as the government's premiere educational center for polygraph and other credibility assessment technologies and techniques. Its central mission is to assist federal agencies in the protection of US citizens, interests, infrastructure and security by providing the best education and tools for credibility assessment. Visit our Courses Offered page for the latest scheduling of NCCA's initial and continuing education courses. You are also invited to review our Research Branch's list of projects and interests, as well as information regarding polygraph standards on the Quality Assurance Program page. Check our website regularly for updates. If you have any questions or comments, please let us know.

             
 
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Psychophysiological Detection of Deception (PDD) Program
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