These four personality types have been called a bunch of different things throughout history, such as the four temperments: sanguine, choleric, melancholic, and phlegmatic.
My professor put up a slide with four columns of adjectives, and we had to choose one adjective in each row that described us. Then we added them up to see which personality we were.
I showed it to Katie and she said it's like those quizzes in Teen Beat magazine that shows was color lip gloss to wear to match your personality. I think this test is pretty much just as accurate as the lip gloss test.
If you want to try it, this test is pretty similar to the one my professor gave us.
I was a Peaceful/Perfect. Katie was a Powerful/Perfect.
I think you could also apply this to the Houses in Hogwarts, where Gryffindor = Playful/Popular, Slytherin = Powerful, Ravenclaw = Perfectionist, and Hufflepuff = Peaceful.
But that would mean I would be in Hufflepuff. Dang it. No one wants to be in Hufflepuff. At least I'm not a Slytherin, like someone else I know (**cough** Katie **cough**).