In chapter 12.2, I read about personality traits and how everyone has different personality traits. Gordon Allport, a psychologist, created a hierarchy of traits where he determined to what degree a certain trait affects a person's personality. He believed that the basic building blocks of a person are called central traits and the most influential characteristics of a person are called cardinal traits. Then, there are the details that define a person's taste in music & clothing, which are called secondary traits. Psychologist, Raymond Cattell, believed that there were two parts that make up a person's personality. He believed that the traits that can be inferred simply through observation are surface traits while source traits consist of the traits that lie in a deeper level of a person. Another psychologist named Hans Eysenck created a simpler trait model that describes someone's personality in three major traits. He analyzed someone and determined to what degree they are associated with introversion or extroversion, with neuroticism (emotional stability), and with psychoticism (how cold/insensitive they are). Lastly, a model of psychoanalysis was created called The "Big Five," which measures someone's personality based on neuroticism, extraversion, openness, agreeableness, and conscientiousness. This model is extremely useful because it helps college students to see how successful they will probably be in school. The "Big Five" also helps to determine how successful they will be in more intimate relationships and what the structure of their personality is. While I think that my personality has been influence by both nature and nurture, I have noticed that a lot of my own traits have come from different experiences and environments that I have grown up in. By spending time with people, listening to music, & traveling, I have been able to develop my own traits, desires, and interests.