Mesfin, Fikre (PhD)Abraham, Adefris2018-12-232023-11-192018-12-232023-11-192018-05http://etd.aau.edu.et/handle/12345678/15278A thesis Submitted to the School of Graduate Studies, Addis Ababa University, in Partial Fulfillment of the Requirements for the Degree of Executive Masters of Business Administration (EMBA)Many governments worldwide have been investing heavily in e-Government project as a strategy to provide the best governmental services to citizens, businesses and employees. However, many governments and academic researchers recognized theproblem of low-level of users’ adoption toward e-Government services. Ethiopian Revenue and Customs Authority (ERCA) is one of Ethiopian government offices that suffer from the lack of users’ adoption of its e-Government services. Therefore, this study is dedicated to identify the factors that affect large taxpayers’ adoption of ERCA’s e-government services using a modified Unified Theory of Acceptance and Use of Technology (UTAUT) model. The research adopted a multi-method approach [combining qualitative (interviews) and quantitative (survey) methods] to explore the efforts done so far by ERCA to implement and diffuse its e-government system and to identify factors that affect actual adoption and use of the egovernment system. For primary data collection, an interview is done with three ERCA personnel and 145 survey questionnaires were also distributedto 19 large taxpayer organizations and 104 complete responses were received. The findings of this research revealed that performance expectancy, effort expectancy, awareness and website quality are significant determinants ofintention to use e-government. In contrast, social influence didn’t show significant impact in determining users’ intention to use e-government system. In addition, facilitating conditions and intention to use e-government are found to be significant determinants of actual adoption and useof e-government system. Moreover, the results of this research revealed that there is a significant difference between the gender of the adopters and non-adopters. However the findings didn’t show significant difference between the different age groups of the adopters and non-adopters.en-USAdoptionE-governmentERCAUTAUTThesis