1. Allport's theory for explaining traits. After he set out to compose a list of traits, he described them as the building blocks of personality. We probably use traits every day to describe ourselves as well as our friends and relatives. Most approaches to personality make use of the concept of traits, but they differ primarily in how they explain the development of individual differences. You mention cardinal, central and secondary traits. Can you briefly define and discuss the differences with an example of each?

2. Cattell attempted to identify and measure the most important traits, and he used data from sources such as objective tests, records (school and work, etc), and observations of behavior in specific situations. His computer program correlated the data and indicated that certain bits of i information tended to cluster together. What are the traits that Cattell referred to source and surface?