Most modern-day psychologists agree there are five major personality types. Referred to as the "five factor model," everyone possesses some degree of each. 1. Conscientiousness. People who rank highest in conscientiousness are efficient, well-organized, dependable, and self-sufficient. They prefer to plan things in advance and aim for high achievement. People who rank lower in conscientiousness may view those with this personality trait as stubborn and obsessive. Fun fact: Studies show marrying someone high in conscientiousness increases your chances of workplace success. A conscientious spouse can boost your productivity and help you achieve the most.

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