School of Specs How standards actually get madeQuick start

TR 21.900 · version 20.0.0 · 97 clauses · Quick start · 15 minutes

How standards actually get made

Somebody wrote down where one company's equipment stops and the next company's starts, and both sides built to the writing. This quick start is about the machinery that produces that writing: who sits in the room, how one person's idea turns into an approved change, what a release is, and where the whole paper trail is kept. Two organisations are held side by side throughout — 3GPP for mobile networks, the IETF for the internet — because they solve the same problem in strikingly different ways. Every claim here links to the clause or the counted file it came from, so you can check any of it yourself.

Start at chapter 1 Sit the final test Look at the document first

This course was written against TR 21.900 version 20.0.0, and built from a source register generated 2026-08-04.

Same subject, different depth: overview · in depth

The document, all of it

One block per clause of TR 21.900, in the order they appear, sized by how much text the clause holds. Lit blocks are taught in this course.

Open the whole of TR 21.900 as a page

The chapters

Part 1 Why standards exist, and who writes them

  1. 1 Why anybody writes a standard down What a standard is for, what it cannot make anybody do, and why every word in one is chosen with such care. 3 min
  2. 2 Who writes them — two organisations, two habits 3GPP's pyramid of named groups next to the IETF's open participation, and the two very different ways each of them reaches a decision. 4 min

Part 2 How the work gets done, and how to check it

  1. 3 One idea, from proposal to published text How a 3GPP document is born, put under change control and changed one Change Request at a time, what a Release is, and how the IETF does the same job. 5 min
  2. 4 Looking it up yourself, and what the record will not tell you How to read a 3GPP number, a version and an RFC header before opening the document, where the decisions are kept, and the questions this paper trail cannot answer. 4 min

Testing yourself

Every question at once

16 questions, chapter by chapter, on one page — for revision after you have read the course.

Open all the questions

The final test

10 questions drawn across the whole course, marked at the end. 60 per cent to pass, and every miss says which chapter to go back to.

Sit the final test

What this course is built on

Chapters
4
Words written for you
3,120
Clauses covered
26 of 97
Figures from the document
0
Abbreviations
0
Published versions
20
Checked sources
120
Sources this course cites
47

The document · Words · History · Documents around it · Every source