The management of patients with gait disorders need the identification and the understanding of gait deviations. It is based on the assessment of gait disorders. This chapter reviews the main methods and tools to assess these disorders. Firstly, the qualitative methods are presented, including the video, the questionnaire-based scales and the observation-based scales. Secondly, the quantitative methods are outlined, including the measurement of the spatiotemporal parameters, kinematics, kinetics, EMG, plantar-pressures and other outcomes. Finally, the most advanced clinical examination in order to assess and analysis gait disorders—clinical gait analysis—that uses several synchronised quantitative tools, is presented with its clinical relevance and its limitations.