This book is useful to know about the Motion Capture(MoCap)System. It is useful for both Electromagnetic and Optical Motion capture system. The author has shown the practical application of Motion Capture System. He analyzed the finger movement of a Pianist. Pianist operates his hands and fingers very smoothly during playing the piano. And the author has analyzed his finger movement very clearly and accurately using Electromagnetic Motion Capture System. This book is useful to calculate finger position, Velocity, Acceleration, Angular velocity and Angular Acceleration. This book is also useful to calculate every movement of the body using Electromagnetic Motion Capture System.