Successful accomplishments of projects have a vital role in attaining organizational goals andrnobjectives. However, this has not been the case in most projects. It is perceived that one of thernmajor factors leading to project success is monitoring and evaluation. The problem on thernavailability and the functionality of M&E unit, not being participatory, and financial and skilledrnhuman resources scarcities and mismanagement problems are the main bottlenecks for the M&Ernsystem in organizations. This raises significant questions as to whether the monitoring andrnevaluation are effective enough to achieve project success. Therefore the main aim of this studyrnwas to assess the practice and role of Monitoring and Evaluation for the success of projects inrnOrbis-Ethiopia, Addis Ababa, Ethiopia.rnThe study used a mix of both quantitative and qualitative research approach (mixed approach). Arncross-sectional survey was conducted for the quantitative part and the qualitative study followedrndescriptive design type. In this study, data were collected from the entire program staff workersrnof ORBIS-Ethiopia who fulfilled the inclusion criterion: 11 from country office and 19 from thernproject sites for the qualitative study and the quantitative study respectively. 10 in-depthrninterview participants participated with a response rate of 91% and 18 participants completedrnwell and that was the response rate of 94.7% respectively. The quantitative data were analyzedrnusing SPSS version 24. Correlation and regression analysis was employed to assess thernsignificance of the association. On the other hand; the collected qualitative data using in-depthrninterviews were coded, and categorized using open code version 4.02.rnFrom the total of 18 respondents, 6 of them agreed and 12 of them strongly agreed on thernsuccessful implementation of projects. The weighted average mean score of 4.43 indicated to usrnthat all of the projects implemented in the Orbis were almost successful. According to thernfindings from the correlation analysis, there was a strong positive correlation between; projectrnsuccess and Indicata (International online M&E processing tool) with a correlation coefficient ofrn0.812, strength of M&E staffs (r=0.722), availability & proper use of the budget (r=0.643), Logrnframe (r=0.675), and with conducting field visits (r=0.626). There was also a positive andrnsignificant relationship between the project success and a global M&E system tool calledrnEndicata (Î² = 0.509, t= 3.032, P-value