X12 produces three types of technical reports, with a goal of facilitating consistent implementations of its work.
Reference Model - Type 2 (TR2)
A Reference Model that addresses a number of X12 standards as they relate to each other, or to one or more business applications.
Implementation Guide - Type 3 (TR3)
An Implementation Guide that details implementation of one or more X12 standards for one specific business purpose. Many of X12's implementation guides are available to view in Glass, use the Table of Contents to the left.
Clarification paper - Type 4 (TR4)
A Clarification Paper that relates to one or more X12 work products and may also relate to external standards or activities. X12's clarification papers are available to view in Glass, use the Table of Contents to the left.