EDI gave every computer one format for business documents and ended the paper bottleneck

Through the 1960s, a single shipment could generate a stack of paper — manifests, bills of lading, invoices — each typed in a different company's format and retyped at every handoff. US transportation companies responded in 1968 by forming the Transportation Data Coordinating Committee (TDCC) to design standard electronic formats for business documents.

The first true EDI standards were published in 1975, beginning with the Rail Transportation Industry Application. In 1979, ANSI chartered the Accredited Standards Committee X12 to extend electronic exchange across all industries, and the X12 transaction sets — purchase orders, invoices, shipment notices — became the language of supply chains.

Adoption built slowly, then compounded: about 12,000 US businesses used EDI by 1991, and Walmart's 2002 mandate that suppliers order only via EDI pushed the rest. Today more than 90% of Fortune 500 companies use X12 or its international sibling EDIFACT, and over 100,000 US firms use EDI.

One machine-readable format for every document

A shared format removed retyping and its errors

One standard meant every new partner connected cheaply

Transportation led, then every industry adopted the same documents

EDI became the rails on which other supply chain software ran

The bottleneck is often the format, not the network: standardize the message once, and every new trading partner connects for free.

EDI never disappeared: Walmart's mandate and the rise of global trade kept X12 and EDIFACT as the default machine language of ordering, invoicing and shipping. Internet-era alternatives emerged, but the network effect of the standard kept EDI entrenched for decades.