自前圍內外有關環境行為的調查多以封閉式的自陳問卷Cselfreportquestionnaire) 來進行測量，而且在得到答卷書的回答後多半沒有進一步檢查行為的真備，因此是否有研究數據不貴的問題一直為研究者所關切。本研究的目的即是探討有追問環境行為細節的題目與無追問的題目對環境行為問卷作答的影響。研究以200 名大學生分兩組進行施測，研究結果發現，有追問問卷比無追問問卷更能獲得謹懂的回答，減少環保行為的高報Cover -report) 。此外，雖無充分證據顯示有追問問卷的信度較高，不過，在有追闊的問卷裡，研究者可以較易察覺到環保行為被高報的情形，所以有追問問卷還是比無追問的問卷來得好。因此，後續測量環境行為的研究宜針對行為的細節加入部分追問的問題，以提高測量的準確性。

Often, studies have measured people's environmental behav咀ior with self-reports. Despite concern has been raised for theaccuracy or validity of such reports, few studies have examinedor tried to control the quality of their participants' self-reportsThis study tested the effect of cross-questioning on people's selfreportof their environmental behavior. Two hundred collegestudents participated in a survey. Half of them were merelyasked about the frequency of their behavior, and the other halfwere further questioned about the behavior details. Results suggestedthat though both groups might have over-reported orover-estimated their proenvironmental behavior, the crossquestionedgroup were less likely to do so. Moreover, thoughfactor analysis failed to show that the cross-questioning questionnairewas more reliable than the no-cross-question questionnaire,the former did provide useful information to check the quality ofself -reports.