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Objective: To establish the interobserver reliability for m electromagnetic tracking device, the Flock-of-Birds system Methods: Two observers independently and in random or dysfunction in the neck and shoulder region (symptomatic (asymptomatic subjects). Measurements included rotation in flexion-extension, and lateral bending (all active and passive (ICC) and agreement by limits of agreement and percentag the part ea-dent ent is plex anatomical structure. Depending on the segment involved, an observer may record a ROM of that segment that may differ from the actual ROM between 58 and 158.3 Different methods, such as optical techniques, radiography, electrogoniography, a Cent gen, Gr