I have always had fun with personality tests. Do I believe in them? Maybe. They can give you a doorway into examining yourself. Just don't let them persuade you to put yourself into a tidy box. None of us are that tidy. If a test says you are A or B -- it really means that, on that day and in that environment and with known others evaluating the results, you have answered in a way such that the result is A or B. The people who administer the Myers-Briggs Type Inventory (MBTI) say specifically that your results may vary depending on when you take the test and your environment. If you are doing the test for the office, you should take the test in the office.
At any rate, whether you think the MBTI (or Enneagram or HEXACO or Berkman or ...) is valid or not, at best it can only give you the DOMINANT aspect at that time and in that environment.
For example, I am INF/TJ in the MBTI. Each of the four attributes (Introversion/Extroverstion, iNtuitive/Sensing, Thinking/Feeling, and Judicial/Perceiving (some say Judging -- I think that word carries too much implied baggage)) are the labels on the ends of four sliding scales. Sometimes, along with the acronym that you end up with, they will give you a percentage score as to just how strongly you tend towards that attribute. For myself, I usually test right in the center between Feeling and Thinking, so I usually put INFJ down if it is asked for but the descriptions for an INTJ sometimes match me.
Not only does your environment make a difference in your results, but the people you are with will affect the way an attribute (assuming you believe in the validity of such -- not all do) manifests. For example, I am moderately Judicial. I aim for the goal, the result, the destination. My wife tests out as a moderate to heavy Perceiving personality. For her, it is the journey that matters, learn and enjoy on the trip and arrive, or not, depending on whatever. When we are together, the urge is for me to move farther towards the Judicial endpoint to "balance" her Perceiving nature. I move in to "take care of the details" while she looks out the window and says "stop here, I want to look at those flowers".
But, a large part of being in a relationship is to value what the other brings with them. Perceiving brings along with it an ability to be flexible. So, over the years, I have deliberately worked on myself to appreciate the value of being flexible. Is that my inherent, comfortable, state -- no. But, I can work with it much better than I could 25 years ago.
And that is true for each of the sliding scales or whatever personality inventory you might be taking. All values are a strength within a certain situation. An Introvert might find it much easier to sit in an office and focus on a bunch of data to come up with useful results while an Extrovert may find it so easy to present the results to a bunch of people and bring energy to the group and the project.
Without conscious work on being able to incorporate the "other side" of the personality scale -- each is weaker than they could be. That introvert may not be able to even consider the idea of presenting results within a group of strangers while the extrovert finds the idea of sitting down, by themself, with a bunch of data, and no external interactions, to be boring to exhaustion. But an introvert who has trained themselves to TEMPORARILY (within that limited time and situation) make use of the extrovert's characteristics will be a much more balanced, and strong individual (and, afterward, probably will need hours in a room by themselves with a good book). Someone who can work through the data, find the results, AND present them to a group in a comfortable manner? I know -- hire them!
