Robustandfaulttolerantsystemshavebeenstudiedextensivelybyacademicandindustrialresearchersandmanydifferentdesignprocedureshavebeendevelopedinordertosatisfyrigorousrobustnesscriteria.Animportantclassofrobustcontrolmethods,introducedbyG.Zamesin1980,isbasedonH1theory.Themainconceptbehind