依據文件生命週期理論(Records life cycle theory)，文件典藏地點、數量與價值會隨不同時期而有所更迭，以將文件去蕪存菁、緩衝庫房壓力。然而如何界定文件處於文件生命週期中的哪一個時期？目前較普遍的做法是以時間作為劃分依據，而時間長短則多為經驗去判斷，沒有特定方法去界定。本文藉由謝倫伯格檔案鑑定理論對文件原始價值與從屬價值的定義與特性，以找出可作為整體庫房館藏生命週期劃分之時間依據，進而利於各檔案庫房制定政策參考，以達更有效之庫房利用。

According to the theory of Records Life Cycle, the repository, quantity, and value of collections will change with time. Evaluation of the status of collections will enable libraries or organizations in charge of preservation to retain valuable records and meanwhile reduce the load of repository. How to define the status of collections? The general way of evaluation at present is based on the year of publication, though there is no specific way of classification except by convention. This paper attempts to identify particular transition points during the life cycle of collections by examining the definitions and characteristics of primary and secondary values of collections proposed in Schellenberg's archival appraisal theory. Results of this study may serve as useful reference for policy-making on effective use of collection repository.