In this competitive business environment continuously improving operationalrnperformance is a crucial issue for the existence of the organization and preferred byrncustomers in the market. The main objective of this study is to assess factors affectingrninternal supply chain integration on organization supply chain performance in the Casernof Cosmar East Africa Business S.C. taking this view in to account, different challengernand obstacles of internal supply chain integration like luck of organizational structure,rnluck of top management support, lack of information usage practice and lack ofrninterdepartmental relationship practice were assessed and described in order to meet thernbasic objective of the research topic. For the theoretical foundation and analysisrndifferent literatures was investigated and the research problem was studied through thernuse of a descriptive research design. Target population in this study was all permanentrnemployees of the company. Since the population is relatively small, the research usedrncensus sampling technique. To carry out the study both primary and secondary data wasrncollected. Data collected was purely quantitative and it was analyzed through descriptivernanalysis and inferential statistics. Descriptive statistical tools such as Statistical Packagernfor Social Sciences (SPSS) were employed to analyze the data. Based on the analyzedrndata and the research finding, the study concluded that the extent of ISCI of the companyrnis low. The result of the analysis also proved that there is strong and significantrnrelationship between internal supply chain integration and supply chain performance. Inrnaddition to that ISCI have a strong and positive influence on supply chain performance.rnThe results also indicated that interdepartmental relationship had the highest effect onrnISCI & SCP, followed by top management support, information usage practice andrnorganizational structure. Therefore, in order to enhance the level of ISCI and SCP of therncompany, the study recommends CEABSC should improve the practice of the studied fourrnfactors those are negatively affected the company supply chain performance.