comparison of three modes of measuring stress coping and humor in schoolage children computerassisted administration of surveys is gaining popularity among many researchers but the equivalence of this method to more traditional approaches such as using paper and pencil has not been determined for many commonly used questionnaires particularly among schoolage children this study examined systematic differences in the responses of 4th 5th and 6th graders to measures of stress coping and humor among three modes of assessment paperandpencil questionnaires computerassisted selfinterviewing casi or a combination of paperandpencil and casi participants were 1245 ethnically diverse children enrolled in public schools in the central region of the united states psychometric and score distribution characteristics were examined using item analyses and analyses of mean and covariance structure as a function of mode of assessment differences in response patterns primarily at the scale score level were documented on some of the key measures in general casi medians and means were higher and correlations among casi measures tended to be lower than those obtained with paperandpencil and mixed mode assessment and casi variances were lower this study suggests the importance of the continued examination of the impact of mode of questionnaire administration when assessing these and other domains of wellbeing in schoolage children