KEY TAKEAWAYS •
Personality involves enduring traits of thoughts, emotions, and behavior that are extremely difficult to change and last throughout the person’s life.
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Personality largely develops in childhood but can continue to change throughout one’s lifetime.
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There are different theories on personality development that vary as to whether it is largely an inherited biological phenomenon or a product of one’s environment.
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The testing of personality can include self-report questionnaires and projective testing.
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Personality disorders fall into three categories and represent social and emotional difficulties in relating to the world that are very difficult to change.
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