 At the end of the 1980s, business process reengineering focused on the radical redesign of the production process through the reintegration of task, labor and knowledge.As a result, lean, flexible and streamlined production processes were created, capable of fast response and internet-based integration necessary for the upcoming phase of supply chains - business-to-business (B2B) – as well as demand chains – business-to-customer (B2C).In the above three stages of Evolution of Management Systems, the competitive advantage was derived almost exclusively from the internal resources of the firm.