NEO Personality Inventory

The (revised) NEO Personality Inventory is a personality measure that was first published in 1990 as an update of the original inventory that was published in 1978. It uses a series of 240 questions to measure the big five personality traits: Extraversion, Agreeableness, Conscientiousness, Neuroticism, and Openness to Experience (The big five traits spell out the word OCEAN). The 240 questions are further broken down to 6 dimensions (or facets) of the main personality traits. This battery of questions was originally designed to measure personality changes associated with aging. Since then, it has been updated several times with the last update occurring in 2010.