[영문]In an experiment embedded in a business survey, subsamples were randomized to obtain none, both or either of two motivation-enhancing enclosures that went out with the covering letter: a sheet explaining the purpose of the survey and another sheet informing about feedback of survey results. All businesses obtained a questionnaire on perceptions of the survey. The main conclusion is that perceptions of the usefulness of the survey are improved by the enclosures while there is no evidence of an effect on perceptions of how burdensome the survey is