"Welcome to the fascinating world of personality psychology!One of the most intriguing aspects of life is the variety that we notice in the people around us. People differ, of course, in their outward physical characteristics. But the variety among human beings is not just “skin deep”: People also differ in their typical ways of behaving, thinking, and feeling. And it is these differences in psychological characteristics—these differences in personality—that seem so important to us for defining who a person is. All around the world, people notice the personalities of the people around them, and all around the world, people find it useful to describe each other’s personalities: Is this person outgoing or shy? Sensitive or tough? Creative or conventional? Quick-tempered or patient? Sincere or deceitful? Disorganized or self-disciplined?"