The internal consistency of the Human Behavior Rating Scale (HBRS) was investigated. The 91-item Likert-type scale is designed to measure five dimensions: persistence, curiosity, externalizing affect, internalizing affect, and cognition. It is used as a research tool to investigate the tenets of Eaves' 1993 integrated theory of human behavior. Three separate sampling plans were employed. Teachers and nonteachers completed Human Behavior Rating Scale ratings of children ranging in age from 5 to 18 years old. Cronbach coefficients alpha were reported by sex, grade, or age for the three samples. Of the 185 reported alpha coefficients, 175 were at or above .90, while 10 had values between .80 and .89.