The purpose of this study was to determine whether a motor adjustment (method of average error) and a verbal response (method of constant stimuli) procedure would yield comparable estimates of depth acuity using the classic Howard apparatus. The findings were that(1) thresholds derived from the two procedures were not significantly correlated under either binocular or monocular viewing conditions; (2) essentially equivalent thresholds were derived from the two procedures under the binocular viewing condition; (3) thresholds derived from the verbal procedure were significantly higher than those derived from the motor adjustment procedure under monocular viewing conditions.