title: Galen: developer of the reversal design?
abstract: Galen, known to psychologists largely for his personality theory of the four temperaments, diagnosed the cause of a patient's symptoms with a form of reversal design long before its formal description (e.g., Sidman, 1960).
authors.affiliation: University of North Carolina Wilmington.
authors.forename: Robert T
authors.initials: RT
authors.lastname: Brown