In the face of the competition, the companies have, possibly more than in the past, a need to innovate. However, if the innovation can be of various natures (product, process, methods, organization…), the search for new solutions to technical problems as soon as the Design phase takes a non-negligible part, and certainly constitutes most of the Innovations "radical", especially when they relate to the product. Conventional methods designed to resolve these problems are often psychological character: methods of creativity. The best known example is the brainstorming session. In all object creation models, of products or of development it is essential, today, to take into account the dimension safety of operation and valuing each project of creation. Of this fact, in addition to the factors related to the optimization of resources, the use of materials and the minimization of releases, it is important to be attentive to the parameters of the safety of operation in the design phase and more specifically to the maintainability of a system repaired. In effect, for its successful integration, and in order to assist teams of design in meeting of creativity or small businesses in the development of their product, we propose a methodological approach based on TRIZ that will solve the problem of the integration of the maintainability in preliminary design phase by generating new concepts of solution in a time reduces which constitutes a decision aid for designers in the case of innovative concepts of product, of space or process. In fact, to succeed its integration, and to assist creative teams in creative sessions or small businesses in the development of their product, we propose a methodological approach based on the TRIZ that will solve the problem of integrating maintainability into the preliminary design phase by generating new solution concepts in reduced time that provide decision support for designers in case of innovative concepts of product, space or process concepts.

Of our days, the question of industrial competitiveness is of particular importance for the industries in all sectors of activity. The next years will be marked by persistent pressures on the cost and the quality of the systems. Of this fact, an analysis of the safety of operation constitutes a necessary approach for the improvement of the operation of the systems by acting as soon as the primary phases of the design on the settings and the factors influencing the functioning of these systems. In effect, the modeling is a critical phase in this kind of analysis and the literature presents several tools enabling this modeling. In operational safety, there is often little information available. It is therefore generally impossible to obtain the parameters describing the Act attached. That is why; modeling tools rely primarily on the judgment of experts, surveys and databases of the manufacturers to build models structured. In this perspective, the Bayesian networks are a powerful solution of modeling for complex systems to merge the knowledge of various natures within a same model. In this logic, we will present a modeling by Bayesian networks of the two concepts of turbine namely direct and indirect in the aim of constructing a decision of choice between the two concepts in the preliminary phase of design of wind turbines while presenting the method, the calculation of the probability of state and the validation criteria of choice.