We use focus groups, surveys, and questionnaires to try to gauge our customers’ needs.我们利用焦点小组、调查和问卷的形式来判断客户的需要。Researchers often use questionnaires in their work.研究人员在工作中经常使用问卷。Badly written questions limit the usefulness of questionnaires.问题设计得不好，调查问卷的作用就会打折扣。