VPG was founded in 2007 by Drs. R.J. Wirth and Michael C. Edwards as a psychometric consulting company providing clients with the most up-to-data methods to meet their scale development, assessment, and general data analysis needs. In 2010, Dr. Li Cai formally joined the company as a third managing partner and, with his arrival, VPG was able to expand its mission to offer state-of-the-art IRT software (flexMIRT®) and a web-based electronic data capture and adaptive testing platform (Adaptest®).
VPG currently has a total of seven permanent members (our three managing partners, a lead developer, a senior psychometrician, a behavioral data scientist, and an administrative coordinator) as well as access to high-quality contractors in the fields of statistics/psychometrics, programming, and interface design when needed, all of whom have been rigorously vetted and hold advanced degrees in their fields of expertise. We serve academic, government, and corporate clients and has been an integral part of teams winning competitive government contracts. Our clients have access to cutting edge research in the science of measurement, but with a focus on choosing the best tool to solve the problem at hand. We pride ourselves on the ability to help our clients with practical applications of rigorous psychometric methods.