It is amazing that virtually no school in the world gives its students a Personality Test. Once you take this test you will have a much better understanding of who you are and what your natural tendencies are, and more importantly, you will understand the people who are not like you much more clearly, and uncover a much easier and more effective way to interact and communicate with those people. While no one can be totally defined by which of the four basic groups they fall into, once you learn how to read peoples colors (Red, Blue, Green, Yellow) you will have a competitive advantage in understanding what will be the most effective way to communicate with them.
Four quadrant personality tests are very common. The DISC test is the most popular version being used today. It is used by many Fortune 500 companies. The basic four personality groups goes back as far as 340 BC to Plato. He called the groups Choleric (Red) Sanguine (Blue) Phlegmatic (Yellow) and Melancholy (Green). We use the colors because it makes the process very simple, and as you will soon see, it lends itself more to the idea of reading others colors, rather than simply discovering your own.