What was the primary approach to development of personality tests employed for the NEO PI?

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The NEO PI, which stands for the Neuroticism-Extraversion-Openness Personality Inventory, primarily employed factor analysis in its development. Factor analysis is a statistical method used to identify underlying variables, or factors, that explain the pattern of correlations within a set of observed variables. This approach helped in identifying the five major dimensions of personality that the NEO PI aims to measure.

What Was the Primary Approach to Development of Personality Tests