The GUEST methodology was conceived as a simple and innovative framework for business management. Actually, this procedure was designed to enhance the efficiency and overall quality of companies by providing a structured approach applicable throughout the decision-making process. Its five distinct phases, Go, Uniform, Evaluate, Solve, and Test, are aimed at controlling a project from conception to implementation. A notable feature of the GUEST methodology is its emphasis on stakeholder engagement, ensuring that their needs and perspectives are integrated into the process. This thesis focuses on the adaptation of the GUEST methodology, originally developed by researchers at Politecnico di Torino, to guide the management and decision-making processes of projects based on social innovations.