Abstract
Usability of digital library is recognised as an important element of any DLs projects. This paper used questionnaire based usability test as a method for evaluating the usability of SDL's interface. Based on related studies, a set of sixteen items covering four axis: efficiency, effectiveness, Aesthetic appearance and learnability have been developed to evaluate the Saudi Digital Library interface (SDL). Twenty-two undergraduate students from the department of Information Studies participated in completing the Likert-scales questionnaire. The main finding of the study indicated that the SDL's interface level of usability practice was not acceptable, in particular regarding aesthetic appearance. Moreover, it seems to be that problems facing other Internet applications in Saudi Arabia will continue to influence the development of digital libraries projects.