Electronic Data Interchange (EDI): One Mark Questions, Book Back Answers and Notes

About Electronic Data Interchange (EDI)

Medium ~45 min study

Businesses send each other a steady stream of documents: purchase orders, invoices, shipping notices. On paper, someone prints the document, posts it, and someone at the other end types it into their own system. Every step adds delay and typing errors. EDI removes those steps by letting one company's computer send the document straight to the other company's computer in an agreed, fixed format.

This unit starts with the history. Ed Guilbert, called the father of EDI, created a standard cargo manifest during the 1948 Berlin airlift, and his work led to the first EDI standards in 1975. It then compares the ways EDI is carried out: direct (point-to-point) EDI, EDI through a Value-Added Network, and the cheaper web and mobile EDI used by small firms.

The last part covers the four-layer EDI architecture and the UN/EDIFACT standard. MCQs often ask for the father of EDI, the difference between EDI and EFT, the order of layers, and the order of units in the EDIFACT structure, so learn those lists in the correct order.

What you'll learn

• Define EDI and list its advantages over paper-based document exchange.
• State the main milestones in the history of EDI, including the contribution of Ed Guilbert.
• Compare direct EDI, EDI via VAN, web EDI and mobile EDI.
• Name the four layers of EDI architecture in order and describe each one.
• Arrange the units of the UN/EDIFACT structure from interchange to simple data element.

Before you start

• Basic computer networks and protocols such as HTTP, FTP and e-mail.
• E-commerce basics, especially B2B transactions between businesses.

Electronic Data Interchange (EDI) explained

EDI Explained

What EDI Does

Electronic Data Interchange is the computer-to-computer exchange of business documents, other than monetary instruments, in a standard format. Purchase orders, invoices and advance shipping notices are typical examples. Because both sides follow the same format, the receiving system can read the document directly, with no one retyping it. The textbook sums it up as: EDI is paperless trade, while EFT is paperless payment.

History and Standards

During the 1948 Berlin airlift, Ed Guilbert designed a standard shipping manifest so that cargo from many sources could be tracked without confusion over formats. In 1975 the Transportation Data Coordinating Committee (TDCC) published the first EDI standards. This work later moved to the American National Standards Institute, whose Accredited Standards Committee developed ANSI X12. The United Nations then developed UN/EDIFACT for international trade.

Types of EDI

Direct EDI, also called point-to-point EDI, connects two trading partners directly. It is fast and suits large companies that exchange many documents with a few partners. EDI via VAN uses a Value-Added Network, a third-party service provider that sits between partners, handles the connections, controls access and keeps the data secure, so companies do not have to manage the network themselves. Web EDI works through an ordinary web browser, and mobile EDI through phones and tablets. Both cost far less and suit small and medium businesses.

EDI Layers

EDI architecture has four layers, from top to bottom. The semantic layer is the business application and describes what the document means, such as a purchase order. The standard translation layer converts the company's own data into a standard format such as EDIFACT or ANSI X12. The transport layer sends the document using e-mail, FTP, HTTP or similar methods. The physical layer is the actual network: dial-up lines, the internet or a VAN.

UN/EDIFACT

UN/EDIFACT (United Nations Electronic Data Interchange for Administration, Commerce and Transport) is an international EDI standard developed under the supervision of the United Nations. Its syntax rules were accepted by the International Organization for Standardization as ISO 9735. The structure is a hierarchy, from largest to smallest: interchange, functional groups, messages, segment groups, segments, composite elements and simple data elements. A composite element is itself made up of simple data elements.

Common mistakes to avoid

• Confusing EDI with EFT. EDI exchanges business documents such as invoices (paperless trade). EFT moves money between bank accounts (paperless payment).
• Describing a VAN as the public internet. A Value-Added Network is a managed service run by a third party that sits between trading partners and controls access.
• Getting the EDIFACT hierarchy upside down. Simple data elements make up composite elements, elements make up segments, segments (and segment groups) make up messages, and messages sit in functional groups inside an interchange.
• Thinking web EDI needs expensive setup. Web EDI runs in an ordinary browser, which is why small firms prefer it over direct EDI.

Test yourself on these with the practice test, then check the worked reasoning in the solved MCQs.

Frequently asked questions

How is EDI different from sending an e-mail?

An e-mail is free text written for a person to read, so someone still has to type its contents into the business system. An EDI document has a fixed structure that the receiving computer reads directly, so an incoming purchase order can go into the order system without retyping.

Why do smaller businesses choose web EDI over direct EDI?

Direct EDI needs its own connection setup, software and technical staff to maintain it, which is costly for a small firm. Web EDI needs only a browser and an internet connection, so it is cheap and easy to use, especially for a small supplier dealing with a large customer.

Who is Ed Guilbert?

Ed Guilbert is called the father of EDI. During the 1948 Berlin airlift he created a standard shipping manifest so that cargo from different sources could be recorded in one format. This idea of a common document format led to the EDI standards used today.

What is a Value-Added Network?

A VAN is a private network service run by a third party. Trading partners send their EDI documents to the VAN, which delivers them to the right receiver, controls who can access them and keeps them secure. Companies using a VAN do not have to manage the network technology themselves.

What do the four layers of EDI do?

The semantic layer holds the business application and the meaning of the document. The standard translation layer converts it into a standard format such as EDIFACT or ANSI X12. The transport layer sends it using e-mail, FTP or HTTP. The physical layer is the network that carries it, such as dial-up lines, the internet or a VAN.

Why is UN/EDIFACT important?

UN/EDIFACT was developed under the United Nations to support e-commerce between countries. Its syntax is accepted as ISO 9735, and it provides standard messages, directories and rules. Because businesses in different countries follow the same structure, their systems can exchange documents without custom conversions.