Abstract
Business world has witnessed huge challenges today, resembled in; speed technological changes and the companies work for achieving the competitive advantage. This study aims to investigate the effects of Enterprise Resource Planning ERP systems on gaining competitive advantage in Jordanian companies from manager's viewpoint .21 questionnaires were analyzed to achieve the research objective. The results of the study show that there is a significant association between the adoption of ERP systems and the different sources of competitive advantages. In addition the study results revealed that is a difference in the opinions of respondents toward achieving the sustainable competitive advantage as it is imitable by other competitors in the market.