These proceedings are devoted to the optimization of product design and manufacturing systems. The book contains selected articles based on presentations given at the IDMME conference held in Nantes, France in 1996. The authors are all involved in cutting-edge research in their respective fields of specialization. The integration of manufacturing constraints and their optimization in the design process is becoming more and more widespread in the development of mechanical products or systems. There is a clear industrial need for these kinds of methodologies. Important, but still unsolved, problems are related to the definition of design processes, the choice of optimal manufacturing processes and their integration through coherent methodologies in adapted environments. The main topics addressed in this book are: the optimization and evaluation of the product design process (design methodology, representation and integration of design constraints, design for manufacturing, synthesis of objects with constraints, automatic modelling); the optimization and evaluation of the manufacturing systems (modelling of machining processes, modelling for control and measuring, feature-based manufacturing, CAM and off-line programming); and some methodological aspects (computational geometry, simultaneous and concurrent engineering, integrated design and CAD/CAM systems, object modelling, feature-based modelling, design and communication, automatic solvers and optimizers). Apart from giving a theoretical background, an important theme is the relation between research and industrial applications. These proceedings should be of interest for engineers, researchers and PhD students who are involved in the optimization of design and manufacturing processes.