Info Tech Guide

Electronic Data Interchange (EDI) is a standardized method for transferring data between different computer systems or computer networks. It is commonly used for e-commerce purposes, such as sending orders to warehouses, tracking shipments, and creating invoices.

EDI is a standard format for exchanging business data. The standard is ANSI X12 and it was developed by the Data Interchange Standards Association. ANSI X12 is either closely coordinated with or is being merged with an international standard, EDIFACT.

An EDI message contains a string of data elements, each of which represents a singular fact, such as a price, product model number, and so forth, separated by delimiter. The entire string is called a data segment. One or more data segments framed by a header and trailer form a transaction set, which is the EDI unit of transmission (equivalent to a message). A transaction set often consists of what would usually be contained in a typical business document or form. The parties who exchange EDI transmissions are referred to as trading partners.

The National Institute of Standards and Technology in a 1996 publication defines electronic data interchange as "the computer-to-computer interchange of strictly formatted messages that represent documents other than monetary instruments.

EDI implies a sequence of messages between two parties, either of whom may serve as originator or recipient. The formatted data representing the documents may be transmitted from originator to recipient via telecommunications or physically transported on electronic storage media.". It goes on further to say that "In EDI, the usual processing of received messages is by computer only.

Human intervention in the processing of a received message is typically intended only for error conditions, for quality review, and for special situations.

EDI is considered to be a technical representation of a business conversation between two entities, either internal or external. Note that there is a perception that "EDI" constitutes the entire electronic data interchange paradigm, including the transmission, message flow, document format, and software used to interpret the documents. EDI is considered to describe the rigorously standardized format of electronic documents. EDI is very useful in supply chain.

The EDI standards were designed to be independent of communication and software technologies. EDI can be transmitted using any methodology agreed to by the sender and recipient. This includes a variety of technologies, including modem (asynchronous, and bisynchronous), FTP, E-mail, HTTP, AS1, AS2, etc. It is important to differentiate between the EDI documents and the methods for transmitting them. 

When they compared the bisynchronous protocol 2400 bit/s modems, CLEO devices, and value-added networks used to transmit EDI documents to transmitting via the Internet, some people equated the non-Internet technologies with EDI and predicted erroneously that EDI itself would be replaced along with the non-Internet technologies. These non-internet transmission methods are being replaced by Internet Protocols such as FTP, telnet, and E-mail, but the EDI documents themselves still remain.