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The purpose of this paper is to present from the scientific point of view the main ideas and the consequent logic which form the basis of the design and of the definition of the performances levels for the Messina Strait Bridge. With the general philosophy of design, one canalizes all the design activities toward specific goals. With the explicit definition of the performances one must reach a delicate balance between the demand for the construction of an appropriate, possibly outstandingly, structure, and the feasibility, both from the engineering and from the economic point of view. Together with the strategy necessary to originate the design of this exceptional bridge, the essential role of the structural analysis supporting the decisional process is enlightened.