It is certain that some company’s activities have an impact on natural environment. These impacts can be related to resources use by company, pollution generation, consequences of its activities on natural habitats.etc. Thus, to reduce their environmental impact, companies should adopt an integrated approach which takes into account the wider implications of their best practices from an environmental point of view.The purpose of this work is to provide both a simplified and quantified tool for a more complex composition of several environmental issues. It can be used to inform decision makers about development trends in their companies. However, it can also be included in a more focused context, such as thinking about company state as regards sustainability, providing informations to critical decisions of process or being able to form the basis for running company in a certain direction.Through this paper, we want to make available a way to assess environmental performance of company's best practices before to decide in their applications or not.