Keep the crap rational.
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When it stated that the test gave out two different types when taken days apart from each other, I think that correlates to how people were feeling that day. Some people can be more cynical or depressed one day and give slightly different answers than when they take it again but are in a happier mood.
I stumbled across this infographic the other day and thought it would be perfect to share here. :)
To see all 16 types: http://careerassessmentsite.com/16-mbti-personality-types-dating-infographic/
The MBTI assessment was developed from the work of prominent psychiatrist Carl G. Jung in his book Psychological Types. Jung proposed a psychological typology based on the theories of cognitive functions that he developed through his clinical observations.
From Jung's work, others developed psychological typologies. Jungian personality assessments include the MBTI instrument, developed by Isabel Briggs Myers and Katharine Cook Briggs, and the Keirsey Temperament Sorter, developed by David Keirsey. Keirsey referred to INTJs as Masterminds, one of the four types belonging to the temperament he called the Rationals.