ABSTRACT
Personality traits are cognitive, emotional, and behavioral characteristics that are stable over time. If such traits predicted personal outcomes, such as behavior or professional success, it would mean that knowing about an individual’s personality helps predict his or her behavior and success. In short, personality psychology examines individual differences in how people think, feel, and behave. A compromise between the general factor assumption and Louis Leon Thurstone’s multiple factor solution has been a widely recognized division of general intelligence into two factors: fluid intelligence and crystallized intelligence. An important factor is schooling and the shifts from menial and industrial jobs to a knowledge economy where exactly those skills count that are measured by intelligence tests. According to a genetic account, traits may have evolutionary roots because stable dispositions to think, feel, and behave may enable people to adapt to their environment.
