Our free career test is designed to give insight into your occupational personality as this information is crucialbefore selecting a career. The test is based on the theory developed by renowned psychologist Dr. JohnHolland. It measures six types of occupational personalities: Realistic (R), Investigative (I), Artistic (A), Social(S), Enterprising (E), and Conventional (C). These are also referred to as Holland Codes or Interest Codes.