<P> ISTJ ( By functions ; Introverted Sensing ( Si ) , Extroverted Thinking ( Te ) , Introverted Feeling ( Fi ) and Extroverted Intuition ( Ne ) ) is an abbreviation used in the publications of the Myers -- Briggs Type Indicator ( MBTI ) to refer to one of sixteen personality types . 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 . </P>
what does istj mean in a personality test
Introverted Sensing ( Si ) Extroverted Thinking ( Te ) Introverted Feeling ( Fi ) Extroverted Intuition ( Ne )