Some people like to take things as they come. They'll figure out tomorrow what they will do that day. That sort of thing would drive other people, myself included, right up a wall. I could never function that way. I have to know today what I will be doing a week, two weeks, and a month from now.
Some people show their emotions visibly and readily.
Others are more stoic, and some will leave you guessing forever what they are thinking or feeling. Certain people make their decisions by depending on their intuition. They go with their gut feeling. Let's reason this out. The one person is quick to make a judgement.