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Ladder Theory: Revised and Revisited
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Canada’s Marriage Fraud Crackdown
Mrs. Control Freak and Mr. Spineless Eat Out
Trunk’s Hypocritical, “Immature and Selfish” Take on Divorce
Jail for Facebook Rant about “Evil” Ex-Wife
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Alpha Redux?

Knowing the MBTI letter designation of a person is not necessarily useful, even assuming they answered the test accurately. It doesn’t necessarily give you an edge to predict their behaviour. But understanding the primary way in which they view the world, and the primary way in which they formulate decisions (on average, and in general) helps you understand the decisions they’ve already made – why they made them. Based on that, and a knowledge of past behaviour, one has, perhaps, a better understanding of the person that one already knows well (not the stranger on the street).
My sister in law is an SP “explorer type. She has never taken a test. I assert this because I know her well. Her behaviour is classically dopaminergic – she craves novelty, is always up for an adventure, hates being tied down. Does this enable me to predict her every action? No. But it does tell me that she would not have made a good match for a homebody like me. It does tell me that perhaps she is not terribly suited for marriage unless her husband can provide constant novelty. That is useful information, IMHO.
I am an “intj”, whatever that might mean to you. Knowing that doesn’t enable you to predict my every action. But it does suggest to someone getting to know me that I need quiet time every day to recharge. That I enjoy intellectual debate, and don’t love overly emotional dialog. That I enjoy reading, systems building, and prioritize competence, in general. This makes me fundamentally different from someone who prioritizes community involvement, spirituality, and emotional openness. The letters don’t matter, the worldview does.