"Optimal Design of Complex Mechanical Systems" presents the foundations and practical application of multi-objective optimization methods to Vehicle Design Problems with an extensive overview of examples. The first part provides an introduction and a general theoretical information about the optimization of complex mechanical systems and multi-objective optimization methods. Several presented applications such as the global approximation approach are brand new in literature and extensively exposed the first time in this book. The second Part of the book shows some examples of the application of the proposed methods to the solution of real vehicle design problems.