Project portfolio selection is a critical issue for many businesses. Tools for project portfolio selection and management are a widely acknowledged requirement in organizations' R&D, production, and marketing operations. The objective of this thesis is to provide an overview of the main methods present in literature to address the Project Portfolio Management, and their application to Punch Torino’s portfolio, to provide an approach that draws on the strengths of the analysed methodologies in order to find the best fit for the company’s needs and assist the management in making project portfolio selection decisions. A first section is dedicated to the Project Portfolio Management analysis, reviewing its main characteristics, the process that leads to the drafting of the portfolio and the professional figures involved, and finally going through the most popular approach to Project Portfolio selection.