In the current economic and social context, Romania can develop normally only by applying the IT&C tools with a maximum efficiency both in engineering and in management. My habilitation thesis is probably a unique one, in its own way, because I have tried to bring together in this thesis, three major areas of education and research: engineering, management and information technology. Thus it seems unusual for an engineer, very analytic for an economist and not very applied for a computer science specialist, this diversity explains the various transformations that I have made in my short...