Researchers have identified various success factors that determine the success of projects atrndifferent times and most conclusions are that no standard prescription works for all projects. Factorsrnmay depend on the nature of the project and the environmental and cultural aspects in which thernproject is implemented. The objective of this study was to assess the success factors of developmentrnprojects and analyze their level of contribution to the success of the project in the implementationrnphase of the project life cycle by taking the case of Energizing Development (EnDev) Ethiopia. ThernProgramme has been running since 2009 and a significant amount of fund has been spent to achievernits objectives. Evidence show that the project is not achieving its target and there are cost andrnbudget overruns as well as changes in the scope of the project during implementation. The researchrnused descriptive research design and applied primary data for the conduct of the research. Theserndata were collected using a questionnaire and analyzed both quantitatively and qualitatively.rnrnSuccess factors identified and tested in this study were the level of top management commitment,rnstakeholders and partners engagement, the competency of project staff, project communication, andrnavailability of fund and their effect on the success of the project. These success factors have beenrnidentified to be tested because they are the widely recognized and accepted success factorsrnaccording to Pinto and Slevin (1987), Khange and Moeâ€™s (2008) and ofOori (2013) and relate closelyrnto the peculiar characteristics of development projects.rnrnAccordingly, the results indicated that the commitment of top management, competency of staff,rnand the availability of fund are currently practiced in a good manner and contributing to the successrnof the project whereas the project has a lot to improve in the engagement of stakeholders andrnpartners as well as internal and external communications in the implementation of the project. Thernstudy recommended that strategies need to be designed and implemented on engaging stakeholdersrnand partners as well as improving the communication culture of the project.