The purpose of this study is to assess the public agency (Information Network and SecurityrnAgency) and private firm (Deliver ICT and Telecommunication Technology PLC) projectrnmanagement practice in line with the ten knowledge areas of the PMBOK and also see thernsimilarities and differences of project management practice of the two organization inrnDevelopment Bank of Ethiopia Network Infrastructure and Security project. Thus, to attain thesernobjectives and reach to conclusion, descriptive research design and quantitative analysisrntechnique was employed. A total of 49 structured questionnaires were distributed. All thernquestionnaires were filled and returned. Overall mean value and percentage from each factor inrnspecific project management knowledge area is used to analyze the similarities and differences inrnpracticing project management techniques in the two organization. The findings show that amongrnthe ten-knowledge area, the public agency who managed the project first phase, managed tornpractice four of them. These are project scope, cost, procurement and resource management. Forrnthe second phase of the project, the private firm practiced project scope, schedule, cost, resource,rnprocurement, stakeholder and integration management. The two organizations have a relativernsimilarity in terms of practicing project scope, cost, resource management in a positive way. Onrnthe other hand, from poor project management practice perspective they have relative similaritiesrnin terms of project quality, communications and risk management. The private firm excel that ofrnpublic agency in practicing project integration management. Additionally, the private firm appliedrnthe practice of stakeholder management and project schedule management and this was not therncase for the public agency. Majority of the presumed challenges by the study for the DBE projectrnwere not great obstacles as response from the responder shows that most of factors were lessrnchallenging. Overall, the private firm practiced most of the factors in project managementrnknowledge area in phase 2 project than phase 1 project by public agency. INSA need to use formalrnprocedure to develop project management plan that holistically define, prepare, and coordinaternall the plan components from all the knowledge area. Both INSA and Deliver ICT need to givernmore emphasis to the practice of project risk management, project quality management andrnproject communication management by allocating proper resource and teams on the ground.