The purpose of this study was to apply the existing studies, which are related to the need forsegmentation of customer satisfaction, to various service sectors. The importance segmentation of customer satisfaction differs in service sector, that is, somesectors require more precise segmentation of customer satisfaction. The primary objective ofthis study is to classify the service sectors based on the meaningful classification standards. The satisfaction of customers with service relates to the evaluation of service quality. Based onthe existing studies, the service quality dimension is divided into the outcome quality, interactionquality, and physical environmental quality. The qualitative investigation was conducted toclassify the service sectors where the specific quality dimension had a relatively importantinfluence on the satisfaction. In addition, it was verified whether the classification based onqualitative investigation was actually reliable from quantitative standpoint. Through this process,it was found that the service sector with relatively important impact of physical environmentquality was the ‘coffee shop’, and service sector with relatively important influence of interactionquality was the ‘bank’. Meanwhile, the service sector with relatively important effect of outcomequality was ‘large marts’. The differentiation of satisfaction groups was defined as moderatorvariable in order to verify whether it was meaningful to classify the satisfaction groups ofrespective service sectors into true satisfaction group and spurious satisfaction group. This study is meaningful in that it validated the moderating role based on the classification ofsatisfaction groups within the framework of existing studies that focused on the mediating rolebetween the service quality dimension and loyalty in relation to the satisfaction.