Internet, especially the worldwide web (www) is one of the most important information service providers which are vastly growing. The adventure of the worldwide web (the facilities and services offered by the internet) brought with itself a revolution in providing of information services to users across the globe such that today an enormous amount of information is available on the Net. On the other hand, its capability to present colorful graphic images, audio and video along with text and links to other contents can be thought of as the most important reason behind the ever-expanding use of the internet. In the last decade, the usability of digital information resources and libraries has turned into an essential concept, which needs to be taken into account when examining any particular group. Digital information resources usability is defined as ensuring that the information and services provided through the cyber net can easily be accessed and used by a wide variety of people groups, with the environmental factors and other facilities available to them. This would be attained only if all internet users were to have an effective interaction with the internet, web, and cyber environments; including digital information resources and libraries, understand and extract the information provided, find their way around and through the internet (web) and control all its incomes and outcomes. The most fundamental and comprehensive definition given for web accessibility is the ability to access the contents of a web by all visitors (Howell, 2007). Therefore, making the digital information resources and libraries of, say, academic organizations and universities, usable in accordance with global standards is a social duty, which consequently benefits the entire society. It must be set high in the priority of academic institutes to make their web sites accessible for all people in a society (Morse, 2007).
Reviewing the literature, such as the works of Marion (2001), Deegan and Tanner (2002), Bawden et al. (2005), and Zhou (2005), concluded that to play an effective and better role in managing and using of digital information resources, individuals should achieve a variety of skills such as: