Shoulder Pain and related dysfunctions affect a significant segment of the population. Technological and life style changes made shoulder more susceptible to injuries. Effective evaluation and diagnosis of underlying musculoskeletal dysfunctions are imperative. Much research has been conducted in motor control dysfunctions of cervical and lumbar regions. There is paucity of motor control researches in shoulder. Through this research work we tried to evaluate the reliability and validity of Dynamic Rotator Stability Test, a test developed with the aim to determine motor control dysfunctions in shoulder.