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E-procurement (electronic procurement, sometimes also known as supplier exchange) is the business-to-business or business-to-consumer or business-to-government purchase and sale of supplies, work, and services through the Internet as well as other information and networking systems, such as electronic data interchange and enterprise resource planning.
The e-procurement value chain consists of indent management, e-Tendering, e-Auctioning, vendor management, catalogue management, Purchase Order Integration, Order Status, Ship Notice, e-invoicing, e-payment, and contract management. Indent management is the workflow involved in the preparation of tenders. This part of the value chain is optional, with individual procuring departments defining their indenting process. In works procurement, administrative approval and technical sanction are obtained in electronic format. In goods procurement, indent generation activity is done online. The end result of the stage is taken as inputs for issuing the NIT.
In the public sector
Public sector organizations use e-procurement for contracts to achieve benefits such as increased efficiency and cost savings (faster and cheaper) in government procurement and improved transparency (to reduce corruption) in procurement services. E-procurement in the public sector has seen rapid growth in recent years. Act 590 of Louisiana's 2008 Regular Legislative Session requires political subdivisions to make provisions for the receipt of electronic bids.
E-procurement in the public sector is emerging internationally. Hence, initiatives have been implemented in Singapore, Estonia, UK, USA, Malaysia, Australia, European Union , Kazakhstan, and South Africa 
E-procurement projects are often part of the country’s larger e-Government efforts to better serve its citizens and businesses in the digital economy. For example, Singapore’s GeBIZ was implemented as one of the programmes under its e-Government masterplan.
The Procurement G6 leads the use of e-procurement instruments in Public procurement.
This field is populated by two types of vendors: big enterprise resource planning (ERP) providers which offer e-procurement as one of their services, and the more affordable services focused specifically of e-procurement. A good example of an open e-procurement platform is https://auxionize.com/en .
An e-procurement system manages tenders through a web site. This can be accessed anywhere globally and has greatly improved the accessibility of tenders. An example is the System for Acquisition Management (SAM), which on July 30, 2013 combined information from the former Central Contractor Registration and Online Representations and Certifications Application (ORCA), in the United States.
- Complex sales
- Construction bidding
- Contract A
- Reverse auction
- Tender notification
- Strategic sourcing
- Public eProcurement
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