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Not just INTJs, but all introverted types that use "Chart the Course" interaction style, to include INTJ, INFJ, ISTP and ISTJ. I get confused as extravert by those who do not know me well. My immediately family will tell people that I am a hardcore introvert.

I referenced to this on another thread regarding extraverts being mistyped as introverts. It's my theory, based on the interaction styles, that all "Behind the Scenes types (INTP, INFP, ISFP and ISFJ) are the true introverts whereas "Chart the Course" types are introverts mistyped as extraverts for those who do not know them well. "Get Things Going" types (ENTP, ENFP, ESFP and ESFJ) extraverts who may be confused as introverts and "In Charge" types (ENTJ, ENFJ, ESTP and ESTJ) are the true extraverts.

The Get Things Going and In Charge types may be reversed, however I think much of it has to do with the need to control information (Behind the Scenes and In Charge) vs the need for movement (Chart the Course and Get Things Going), but could as well be the directing (In Charge and Chart the Course styles) vs informing (Get Things Going and Behind the Scenes) communication styles.