Assefa, Temtim (PhD)Andargachew, Hiwot2021-03-262023-11-182021-03-262023-11-182020-09http://etd.aau.edu.et/handle/12345678/25702The rapid development in Information and communication technology (ICT) has broken barriers to information and open a new way for scholars in higher education institutions to communicate and disseminate their research findings. Universities have established open access institutional repositories in an effort to capture research results produced by their students and academics.However there is very limited literature on satisfaction of users towards open access institutional repositories in Ethiopia and userssatisfaction have not beenstudied. The aim of this study isto explore the current level usage and satisfaction of postgraduate students towards open access institutional repositories in Addis Ababa University using a conceptual model adapted by Delone and McLean (2003) and the study of Compeau & Higgins (1995) which focused on variable Self-Efficacy. The study reviewed literature on open access institutional repository anduser satisfaction. A mixed research approachwasused to collect data from respondents. Due to corona virus pandemic,the data was collected by administering online questionnaires based on adapted model and Phone interview.The questionnaire‘s was sent to postgraduate students of AAU via email. Descriptive statistics and linear regression analysis were applied to perform the data analysis. The results fully supported the effect of the quality antecedents‘ towards user satisfaction of postgraduate students. From the quality antecedents,‘ Service quality have been found to be major determinant factor which contributed (34.3%) touser satisfaction of the system. Regarding to behavioral intention information quality and self-efficacy have been found to be statistically significant and information quality has been identified as a dominant factor which contributed(63.4%) to behavioral intention to use the system. Furthermore, userssatisfaction of postgraduate students towards the OAIR system haveshown to be the main factor which contributed(48%) actual usage of the system. Thestudy concludes and recommendsthat the university libraryand other stakeholders includingthemanagement ofthe university should promote the availability and accessibility of thesis and dissertations and related services to make the system better.Furthermore, In order to make the system more usable by users, design modification is a needed. The system should include frequently asked questions section and should be integrated with online help/support services to allow users to obtain materials they are interested in. Keywords: Openaccess, Institutional Repository,Addis Ababa University,User satisfaction, Mclean and Delone model, descriptive statistics, Service qualityenOpenaccess,Institutional Repository,Addis Ababa University,User satisfaction,Mclean and Delone model,Descriptive statistics,Service qualityThesis