I tested INFJ first time.
[RANT]I think you have to know yourself really well, to the point of objectivity, in all the areas the test questions. I don't believe any type is purely objective in that sense, and it doesn't help that most people are taking the test to learn more about themselves. They use their MBTi type to help learn more, and at the same time learn with a huge bias in what they explore or believe as a result of it. It can highlight strengths and produce feel good moments, but tomorrow I might waking feeling like ISTJ is the way for me, and learn a sudden appreciation of thinking that way and seeing the world that way. Tell me some idiots who thought they'd choose 16 categories, rather than 25 or 10 or whatever else they could've chosen, will change that. They are arbitrary, and if someone can ever explain a scientific basis for grouping by these things, rather than it just being comfortable groupings in social terms, I might believe there is something to it. That isn't to say you can't group humans, just that this is all we are doing. Creating modules where there are no clear barriers. We group all the time, I can group black haired people, blue eyed people, there are traits to group, but why do the groups mean anything deeper than blue eye people have blue eyes and black haired people have black hair. Obviously they are genetic things, but I was highlighting them as superficial things we perceive hence group. The human brain is adaptable, that is the beauty of it. If anything MBTi has made me bored of being my type and want to explore the world as something new. Type is a limitation. And a boxing in of thinking and perspective. And you'll never learn that more than when you put an F in your type. If there is another way to see it, why not go there. Is it an excuse to be something, and not learn more? And does defining self achieve much more than comfort and restriction in what you can be?
Why does anyone need to be anything except to keep others happy with an image? Humans are too dynamic to define, and regardless of the four letters next to names, social cliches, whatever else, everyone should be met on a personal basis, because that is the only level you will ever truly define them on. And I believe it has never been the goal of psychology to change that.[/RANT]