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A Decentralized Model Reference Adaptive Control (DMRAC) method is developed for Large Flexible Structures (LFS). The development follows that of a centralized model reference adaptive control for LFS that have been shown to be feasible . The proposed method is illustrated using a simply supported beam with collocated actuators and sensors. Results show that the DMRAC can achieve either output regulation or output tracking with adequate convergence, provided the reference model inputs and their time derivatives are integrable, bonded, and approach zero as tÂ¿ Â¿.