Abstract : A method of testing for the efficacy of dental premedication in children, using a double blind condition for obtaining ratings of manageability by dentists and of emotionality of psychologists, was investigated. Film and sound recordings made during a standard dental procedure on apprehensive children were used for judgments. Variables of the study were degrees of 'emotionality' and 'manageability' on the first and second visits; and, the effects of premedication with chloral hydrate and methampyrone. The technique yielded a reliable, valid, and sensitive index.