This book contains the edited version of the lectures presented at the NATO ASI on computer-aided analysis of rigid and flexible mechanical systems, held in Tróia, Portugal, from June 27--July 9, 1993. The topics presented include formulations and numerical aspects of rigid and flexible multibody dynamics, object-oriented paradigms, optimal design and synthesis, robotics, kinematics, path planning, control, impact dynamics, and aspects of application. The book discusses these topics in a tutorial and review manner, providing a comprehensive summary of current work. It is therefore suitable for a wide range of interests, ranging from advanced students to researchers and implementers.