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Research is increasingly demonstrating the importance of monitoring indices of happiness as part of behavioral programs for individuals who have severe intellectual disabilities. We evaluated a practitioner-oriented process for identifying and validating individualized indices of this private event among three adults with autism who were nonvocal or minimally vocal. Caregiver surveys were administered to obtain agreement regarding behavior displayed when the individuals were happy and unhappy, as well as situations in which they were likely to experience happiness and unhappiness. Observations corroborated caregiver opinion in that participants displayed more happiness indices in situations reported to be accompanied by happiness, and for the most part, more unhappiness indices in reported unhappiness situations. Subsequent choices by each participant supported the validity of the individualized indices. Results are discussed regarding how identifying happiness indices can be a useful component of behavioral applications, as well as guidelines and cautions regarding use of the indices in routine practice. [ABSTRACT FROM AUTHOR]