The Holland Code-s or the Holland Occupational Themes (RIASEC), is a theory of careers and vocational choice (Making A Living) based upon personality types (Personality Test). It was developed by the psychologist John L. Holland.  Each letter or code stands for a particular "type": Realistic (Doers), Investigative (Thinkers), Artistic (Creators), Social (Helpers), Enterprising (Persuaders), and Conventional (Organizers)." http://en.wikipedia.org/wiki/Holland_Codes
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