This book contains an edited version of the lectures and selected contributions presented during the Advanced Summer Institute on "Product Engineering: Eco-Design, Technologies and Green Energy" organized at the Transilvania University of Brasov, Romania, July 14-21, 2004. In the last few decades Product Engineering has become a multidisciplinary field including aspects from a wide range of scientific areas. Aspects related to eco-design, aesthetic style, human factors and ergonomics are now critical issues for the success of a product on the market. It has been shown that these apparently separate fields of research belong to the same multidisciplinary mainstream of Product Engineering and cannot progress unless an integrated approach is adopted. New advances are now likely to produce changes in the entire product life cycle chain. This is often illustrated within this book by similar methodologies used for different goals, e.g. the Virtual Engineering techniques in general, which are multi-purpose technologies or the recent interest raised by the particle based models for CAD and simulation purposes. The volume is divided into five main parts, covering the topics of Eco-Design, Computer Aided Design, Simulation Technologies, Robotics and Manufacturing and Green Energy. Audience: This work will be of interest to a wide range of readers, from students to graduates, and from industrial experts to researchers active in the field of Product Engineering.