由於電子書數位化的特性，讓許多書上原有的環境線索消失了，像是資訊在空間上位置，及紙本書提供固定的空間概念，讓使用者利用電子書念書時，缺少這些環境線索幫助他們對內容建立架構的概念，線索與內容做連結，並且在複習時能快速的找到資訊，大部分的電子書，都有提供劃線、寫筆記、貼書籤的功能，這些功能不論是在上課跟著老師做筆記或是自行研讀教材時，皆可以滿足學生的需求；在複習階段時，由於學生對內容已經研讀過，在心中已經建立一個內容架構的概念或是認知地圖(cognitive map)，利用電子書去找資訊做複習時，因為電子書環境總總的變動，讓使用者在過程中，必須要瀏覽許多不必要的資訊，造成額外的認知負荷，然而，利用環境線索對資訊做再次的瀏覽(revisitation)是有幫助的，因此我們去調查當學生對於念過的教科書內容做再次的瀏覽時，會使用到哪些環境線索，並且將這些環境線索加入電子書中。
然而，電子書上支援的環境線索被使用與否，取決於使用者唸書的習慣，因此我們加入閱讀策略SQ3R(Survey、Question、Read、Recite、Review)，讓使用者在閱讀時可以多加使用環境線索，讓內容和環境線索有所連結，幫助建立內容架構的概念，在複習發揮功效幫助使用者快速找到資訊去做複習。
經過實驗評估後發現，我們結合環境線索與SQ3R閱讀策略的電子書系統，能夠提升學生複習的成效，並且大大的減少找資訊的時間，未來會對學生在學習時，使用的環境線索有更深入的調查，並且嘗試加到我們目前的電子書系統，讓使用者更便利且更願意使用電子書去學習。

The e-book market with the most potential is the university campus, and the most prospective groups are students. Three common cases are present when students use e-books for learning on campus: (1) they take the e-book to attend courses; (2) they use it to study on their own; and (3) they review textbooks to enhance their memory of the content and prepare for exams. Most e-books support functions of highlighting, taking notes, and adding bookmarks for students to read the material, and these functions suffice for reading. However, when they want to review content, they are required to drag the scrollbar to revisit information, though the speed of turning pages varies and lack of spatial cues, and they may frequently navigate unrelated chapters and watch much unrelated information. Using contextual cues to help people revisit information is useful. According to our study, chapter names and the locations of information space are critical for readers revisiting information. However, these cues are used depending on the reading habits of users. This study thus employs an SQ3R reading strategy to enable users to utilize more cues, and consequently presents a design of an e-book system with integrated contextual cues (space) and the SQ3R method. The results of the experiment shows that the proposed e-book system can help students enhance reviewing performances, and reduce the time to revisit information compared to a typical e-book.

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