The authors present two questionnaires developed to measure attitudes toward computers. The first is designed to measure attitudes toward computers in general the second to assess attitudes toward a specific medical information system. Data concerning the reliability of these instruments are presented. Data concerning both the predictive and the concurrent validity of these measures are also presented. The results indicate that scores on both of the questionnaires assessed prior to computer implementation are reliable and valid predictors of post-implementation adaptation to the computer and preceptions of training. Scores on the questionnaires designed to assess specific attitudes, measured at three points in time, are also related to concurrent measures of job satisfaction and adaptation to the computer system.