I wondering about my friend whether he might be an ISTJ. I know he's at least IXTJ. I can't tell though if he's an S or an N. But I'm leaning more towards S for him, but I'm not perfect at typing people. I knew he's definitely an introvert. He is definitely a thinking type rather than feeling. And he's definitely judging. He definitely far from spontaneous, and he very structured in his planning. But what should I look for to know if he might be more of sensing type? That's the letter I'm always stuck on.