This report provides a comparative analysis of project management methodologies, focusing on three distinct organizations: Organization A, Organization B, and Organization C. Organization A, a financial services company, is analyzed for the implementation of PRINCE2, while Organization B, a building society, is examined for the adoption of PMBOK. Organization C, an IT firm already using CMMI, is assessed for the integration of PMBOK. The report outlines the proposed methodologies, implementation strategies, and potential challenges for each organization. For Organization A, it details the five phases of PRINCE2 implementation, including start-up, initiation, controlling project stages, managing stage boundaries, and project closure. For Organization B, it focuses on leveraging the PMBOK framework, highlighting its five key stages: initiation, planning, execution, controlling, and closing. For Organization C, the report discusses how PMBOK can complement CMMI practices. The report also addresses the issues in implementation for each organization, such as the need for training and cultural adaptation for Organization A, selective adoption of PMBOK for Organization B, and the complexity and commitment required for Organization C. The report provides a comprehensive overview of the challenges and considerations associated with adopting these methodologies across different organizational contexts.