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Vol: 52(66) No: 3 / September 2007 Delay-range-dependent Stability for Systems with Time-varying Delay and Nonlinear Perturbations Walid Kacem UCA, Ecole Nationale d\'Ingénieurs de Sfax, ENIS, BP W, 3038, Sfax, Tunisia, phone: (216) 74 274088, e-mail: kacemwalid@yahoo.fr, web: www.enis.rnu.tn Mohamed Chaabane UCA, Ecole Nationale d\'Ingénieurs de Sfax, ENIS, BP W, 3038, Sfax, Tunisia, e-mail: mohamed.chaabane@ipeis.rnu.tn Driss Mehdi LAII, Ecole Supérieure d\'Ingénieurs de Poitiers, 40 Avenue du Recteur Pineau, Poitiers, France, e-mail: driss.mehdi@univ-poitiers.fr Mohamed Kamoun UCA, Ecole Nationale d\'Ingénieurs de Sfax, ENIS, BP W, 3038, Sfax, Tunisia, e-mail: mohamed.kamoun@enis.rnu.tn Keywords: Time-delay systems, delay-dependent, robust stability, Linear Matrix Inequality, Nonlin-ear perturbations Abstract This paper deals with the robust stability of uncertain systems with time varying delay. The uncertainties under consideration are nonlinear perturbations. 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