Measurement of human movement and gait analysis has less popularity in the clinical practice, because in order for an outcome measure to be an effective and to be utilized as an effective outcome measure in related to gait analysis, it must be accurate. Therefore, the aim of this study is to investigate the intra-rater reliability, within day and between days, of Siliconcoach in measuring hip, knee, and ankle joint angles at initial contact, loading response and toe off phases during walking.