This thesis work, the result of an internship at the Purchasing department of Italdesign Giugiaro in Moncalieri (TO), has the aim of introducing improvements to the current purchasing process of components for the physical development of a car. To do this, it is first necessary to provide a general overview of Purchasing Management, basic concepts of Lean Supply Chain and the evolution of Procurement activities, strategic activities that allow companies to have a competitive advantage in the market. The tools, necessary to better address Purchasing Management problems, that have made the purchasing area definitely important in the business context over the years, have been studied and analyzed in this thesis.