Psychologists also use it as a clinical measuring tool to diagnose psychiatric disorders and help with prognosis and therapy planning. It measures personality based on Cattell's 16-factor theory of personality. "Each item should be influenced to a degree by the underlying trait construct, giving rise to a pattern of positive intercorrelations so long as all items are oriented (worded) in the same direction." A recent, but not well-known, measuring tool that psychologists use is the 16PF.
All of these tests are beneficial because they have both reliability and validity, two factors that make a test accurate. Examples of such tests are the: Big Five Inventory (BFI), Minnesota Multiphasic Personality Inventory (MMPI-2), Rorschach Inkblot test, Neurotic Personality Questionnaire KON-2006, or Eysenck's Personality Questionnaire (EPQ-R). Two main tools to measure personality are objective tests and projective measures. Due to the fact that personality is a complex idea, the dimensions of personality and scales of such tests vary and often are poorly defined. Personality can be determined through a variety of tests. The various approaches used to study personality today reflect the influence of the first theorists in the field, a group that includes Sigmund Freud, Alfred Adler, Gordon Allport, Hans Eysenck, Abraham Maslow, and Carl Rogers. Psychologists have taken many different approaches to the study of personality, including biological, cognitive, learning, and trait-based theories, as well as psychodynamic, and humanistic approaches. The study of the psychology of personality, called personality psychology, attempts to explain the tendencies that underlie differences in behavior. Nevertheless, most theories view personality as relatively stable. On the other hand, more behaviorally-based approaches define personality through learning and habits. Trait-based personality theories, such as those defined by Raymond Cattell, define personality as traits that predict an individual's behavior. While there is no generally agreed upon definition of personality, most theories focus on motivation and psychological interactions with the environment one is surrounded by. Personality is the characteristic sets of behaviors, cognitions, and emotional patterns that are formed from biological and environmental factors, and which change over time.
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