On which research method did Gordon Allport rely in developing his theory of personality?

Question

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Allport is known for his emphasis on the individuality of personality and for his detailed case studies, which he used to illustrate and support his theories. He believed that understanding the unique, complex human personality required in-depth examination of individual lives, rather than relying solely on statistical methods or broad generalizations.

On Which Research Method Did Gordon Allport Rely in Developing