摘要: While there were many efforts in the research and practices of digital libraries, evaluation was not a conspicuous activity. It is well recognized that library complex difficult undertaking. Challenges facing are enumerated. A conceptual framework for suggested. review practice concentrates on derivation criteria used evaluation. Essential requirements stated. Discussed constructs, context, libraries: What should we evaluate? For what purpose do Who At level Upon In addition, included suggestions adaptation from related activities. The article considered as part evolution concepts