In the last three decades mechanisms with parallel kinematical structures have caught the attention of researchers in the field of robotics. This class of equipment can be preferable to serial chain mechanisms in industrial applications due to the exclusive structural properties. This book is dedicated to the kinematics of 3-DOF parallel manipulators. AUTRAP concept for the trajectory planning of serial manipulators is described in the final chapter of the book. This approach provides an extra possibility for robot motion planning based on the methods of the motion optimization for serial robots. This book is useful to specialists in Robotics and Mechanical Engineering.