Development of a digital library demands extensive financial, human, and technological investments. Appropriate models and measurement tools are required to achieve the goals of these libraries to assess them. This research was conducted with the aim of developing and validating a tool to measure the maturity of a digital library based on the “digital library maturity model” (DLMM). Two sources including literature and experts' opinion were used to determine the criteria for each code. Expert opinion and confirmatory factor analysis were used to confirm the content and construct validity of the developed tool, respectively. The reliability of the designed tool was examined by the Cronbach's alpha test. Finally, the designed tool validity and reliability were confirmed. Managers of digital libraries can use this tool to understand the maturity level of their digital libraries and plan to improve the library or to attain advanced levels of maturity.

数字图书馆的发展需要大量的资金、人力和技术投资。需要适当的模型和测量工具来实现这些库的目标以对其进行评估。本研究旨在开发和验证一种基于“数字图书馆成熟度模型”（DLMM）的衡量数字图书馆成熟度的工具。包括文献和专家意见在内的两个来源用于确定每个代码的标准。专家意见和验证性因素分析分别用于确认开发工具的内容和结构有效性。设计工具的可靠性通过 Cronbach's alpha 检验进行检验。最后，验证了设计工具的有效性和可靠性。