This book addresses a critical but often overlooked perspective in project management: that of organizations that acquire projects from the market and must govern results delivered by external suppliers. Moving beyond traditional execution-focused approaches, it provides a practical methodology for Purchasing Organizations: organizations that remain accountable for objectives, requirements, deliverables, risks, costs, quality, and value, even when technical execution is entrusted to consultants, system integrators, contractors, or specialized suppliers. Grounded in established frameworks such as PRINCE2 and PM², and enriched by practical experience, the book guides executives, Project Managers, PMOs, senior managers, functional leaders, procurement professionals, and public administrations through the full project life cycle: from Business Case and portfolio selection to planning, baseline definition, execution control, closure, and handover.