How Do You Define "Personality"?

Personality is an everyday term we all know and use.

The ways psychological scientists talk about personality in their formal course of study presents puzzling challenges and raises new questions about what really makes us, us.

Consider the talk below from the personality psychologist Brian Little. 
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Did you know the popular Myers-Briggs Type Indicator (MBTI) test is not typically used as a personality index in psychological science? Instead, psychological scientists more often draw on a version of "The Big Five." This popular personal measure includes the following traits:

You can see where you score on The Big Five and learn more about them at The Open-Source Psychometrics Project or through BigFive-Test.com.