In this study, we have proposed a model of the sliding window coherent system in case of multiple failures.The considered model consists of G linearly tasoliesi required multi-state elements and G number of parallel elements in A-within-B-from-D/G for each multi-state.The system fails if at least A group elements out of B consecutive of D consecutive multi-state elements lawn chairs 9 inches off the ground have performance lower than the weight w.We have evaluated the signature reliability, expected value and system sensitivity on the basis of the extended universal generating function of the considered system.