1.Web-based ERP (Enterprise Resource Planning): creating and approving purchasing requisitions, placing purchase orders and receiving goods and services. 2. E-MRO (Maintenance, Repair and Overhaul): as ERP except that the goods and services are non-product-related MRO supplies. 3. E-sourcing: identifying new suppliers for a specific category of purchasing requirements. 4. E-tendering: sending requests for information and prices to suppliers and receiving their responses. 5. E-reverse auctioning: buying and services from a number of known or unknown suppliers.6. E-informing: gathering and distributing purchasing information between internal and external parties.7. E-marketsites: integrates buyers and suppliers with their associated order and financial systems: opens up value chains
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