Abstract: The purpose of this study was to analyze the effect of project planning on the project implementation success in Rwanda using a case of Sebeya Water Resource Board in Rubavu District. The specific objectives of the study were to identify the effect of scope planning in project implementation, to analyze resource planning in project implementation and to assess the effect of duty planning in project implementation at Sebeya watershed management project by Rwanda water resource Board, Rubavu District. The study is helpful in acquiring skills on how watershed management project is planned and skills that beneficiaries have in executing this project which stimulates its effective implementation. Future studies related will use results from this study to obtain a useful literature review.