Evolution of human to walk on two feet is a process accomplished in three million years. The coordination of rhythmic movements is produced by locomotor generators at spinal cord level under the control of supraspinal mechanisms. The analysis of these rhythmic movements goes beyond 320 BC. However, it was Verne Inman and Jacqueline Perry who have presented the three dimensional gait analysis into clinical use as the way we understand. Along with this progress, by using quantitative gait analysis, gait disorders were defined objectively and reliably as well as treatment decisions were made. But it should be kept in mind that the kinetic, kinematic, and dynamic EMG data obtained can be relevant clinically only if they are interpreted by experienced clinicians.