A new study of over 1.5 million people have concluded that there are 4 personality types that we fall under. They are average, reserved, self-centered and role model. The past personality traits models are a little out-dated said William Revelle, a professor at Northwestern University. This study that was done in the United States and the United Kingdom “presents a very strong case for personality types defined by configurations of the Big-Five personality traits,” said John A. Johnson, a Pennsylvania State University psychologist. Take the test for yourself and see what you get.