The WorkPlace Big Five ProfileTM 4.0 personality assessment is based on the Five-Factor Model of Personality. Paradigm Personality Labs first introduced the Big Five or the Five Factor Model of Personality to the business world and began using it with clients across the United States in the early 1990’s. Derived from current, well respected, university research that used high speed computers for complicated data analysis, the model is not based solely on a theory. Rather, it is based on concrete, empirical data-indisputible facts that are reliable, valid, repeatable, and hold up under intense scrutiny.