What technique is used by trait theorists to reduce the diversity of traits to as few as three or five underlying traits?

Question

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Trait theorists use factor analysis to identify underlying dimensions of personality and to reduce the diversity of traits to a smaller number of significant factors. Factor analysis is a statistical technique that identifies clusters of related items on a questionnaire or measure, indicating that they measure a common underlying construct or trait. By analyzing the intercorrelations among different traits, factor analysis can determine which traits are most closely related to each other and group them into a smaller number of factors. This allows for a more parsimonious and comprehensive understanding of personality, based on a more basic set of traits or dimensions.

What Technique Is Used by Trait Theorists to Reduce the Diversity