The last past years have seen the emergence of some changes in the whole society as well in the concerns than in the behaviour. Indeed, people are now more and more concerned about the ecology and it is in this optic that the researchers have dealed with this thesis. The purpose of this thesis is to provide a new model in order to measure how deep a company is involved in the Green Marketing. In this thesis the authors have leaded a multiple-case study about the automotive industry in order to see how deep are the companies involved in the green marketing, and how the deal with this new kind of marketing. The results showed that the four brands studied are deeply involved in the green marketing and that they plan it and change their processes in order to be more environmental friendly using a lot of different means. This study is a good starting point to implement a green marketing strategy for the companies as until now it was clear about how to become green for a lot of companies.