Every company has a business model whether it is presented explicitly or not on the web site or in other internal documents. For entrepreneurs the business model represents an element of the gestation phase in the life cycle approach of a business (see chapter 1.1) where it is positioned after the phase of opportunity identification and previous to the phase that is dedicated to the elaboration of a business plan. In such a position the business model is an important tool that enables entrepreneurs to evaluate their relation with the main stakeholders, with the environment in which they want to start-up and develop their business idea.