This document summarizes a doctoral thesis on project relationship management and the Stakeholder Circle, a tool designed to help project teams effectively manage stakeholder relationships. The research indicates that the success of projects is directly influenced by stakeholders' perceptions and relationships with the project team, and it highlights the importance of identifying and engaging the right stakeholders throughout the project lifecycle. The Stakeholder Circle methodology enhances project outcomes by facilitating improved stakeholder engagement strategies, which have been commercialized and are applied by various organizations.