![]() His four temperaments are still used, albeit in revised or renamed versions, to describe differences among people despite the fact that his biological assumptions were incorrect.Ĭompared with those ancient practices, the idea of psychometrics – using standardized measurement techniques to describe differences in personality – is quite recent. The Greek philosopher Hippocrates ascribed four personality types to the effects of varying levels of different bodily fluids (blood, bile, etc.). Long-established caste and other hierarchical social systems describe differences in people based on birth circumstances, such as being an untouchable or having royal blood. ![]() In multi-theistic traditions, the gods themselves have distinctly different personalities. Various religious texts describe gifts from gods, many of which are like personality characteristics. The Mesopotamian society provided the 12 signs of the zodiac, which astrologists use to describe personality differences based on the day of birth. Ancient Chinese society described personality types based on the year of birth. The idea of personality types is hardly new. The SDI 2.0, like all modern personality assessments, rests on the conceptual foundation laid by earlier societies and theorists. Let’s rewind the clock a bit and get started. I wanted to commit the facts to writing and hoped that the story would be interesting for anyone who uses the SDI 2.0. I wrote this article because I realized that I was the sole keeper of an “oral history” of the SDI. I use the first person when I narrate my own involvement or add personal observations. I am both the narrator and an actor in this story.
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