Abstract : Although substantial literature exists on visual analog scales (VAS), much is directed toward the clinical assessment of pain. As part of a Naval Aerospace Medical Research Laboratory (NAMRL) effort to investigate the chronopharmacokinetics of methamphetamine during simulated sustained flight operations we developed a computerized VAS to determine the intensity of subjective responses associated with the administration of the stimulant. With simple modifications to the program, the questionnaire could be modified and used to test subjects' responses to a number of drugs, with better resolution Of response than hand-scored methods allow. Visual Analog Scale, Stimulant, Drugs, Methamphetamine, Questionnaire.