The five-factor model is based on the work of Carl Rogers and the five traits he identified (unconditional positive regard, empathy, congruency, etc.).

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The five-factor model is actually based on the work of several different researchers, including Raymond Cattell and Paul Costa and Robert McCrae. While Carl Rogers' work on person-centered therapy and his identification of certain traits such as empathy and congruency may have influenced the development of personality theories, they are not directly related to the five-factor model.

The Five-Factor Model Is Based on the Work of Carl