Abstract
In addition to decrees and decisions of government policies forcing companies to lead a process of changing, which is part of sustainable development, promotion and encouragement can be developed based on marketing tools. The difficulty of convincing a company to implement its management with the recommendations of sustainable development practices lies in encouraging them to start a policy of changing. That is why it is consequent to push the company to rethink and put in place a new managing system. Awareness of companies and citizens is in the centre of our communication, the state should be the first to be aware that it is nowadays essential to protect its resources, and then must introduce legislation in this way. When legal documents requiring individuals and firms to change their behaviours are absent, is not it possible to persuade firms to pursue a policy of sustainable development through the use of practices based marketing strategies (case of Non Governmental Organisations)? How should the marketing department of these companies work to transform the expenditure incurred by the changing process in a redoubtable competitive advantage (the case of businesses)?