This portfolio provides a comprehensive overview of project management principles, focusing on the critical role of the project manager in commercial negotiation, conflict management, and stakeholder engagement. It delves into methods for identifying and reconciling conflicting objectives, addressing project delays and disruptions, and evaluating project management tools for conflict resolution. The portfolio also examines contractual arrangements in commercial projects, exploring diverse government and non-government agreements, and analyzes arguments using logic and persuasion. References to key resources such as the PMBOK Guide and Collaborative Project Procurement Arrangements enrich the analysis, providing a robust understanding of project management standards and frameworks and their impact on commercial negotiation. This resource is available on Desklib, a platform offering a range of study tools for students.