---
title: "Ch 3 — The Law We Quote"
description: "Part I, Ch 3 argues that the law we quote under Ashby's name is Beer's compression, and that the good regulator theorem does not prove what we cite it for."
url: "https://wiki.cybernetic-futures.org/punch-and-judy/part-01-inside-the-model/ch03-the-law-we-quote"
modified: "2026-11-12T15:26:25.882Z"
language: "en"
site: "Cybernetic Futures"
---

# Ch 3 — The Law We Quote

[Chapter content](https://wiki.cybernetic-futures.org/punch-and-judy/part-01-inside-the-model/ch03-the-law-we-quote/ch03-the-law-we-quote-content) · Overview diagram

# Ch 3 — The Law We Quote Is Not the Law Ashby Wrote

**Part I — Inside the model.** The manuscript argues that the version of Ashby's law we quote under Ashby's name is Beer's compression, that the good regulator theorem does not prove what we lean on it for, and that the correction asks for different footnotes, not a new experiment.

## The question
Is the law we quote — "only variety can absorb variety" — what Ashby wrote, and does the good regulator theorem prove what we cite it for?

## The finding
The chapter sets Ashby's own sentence (1956, ch. 11) beside Beer's compression. With Beer's verb the law becomes an instruction to a designer — match the varieties by amplifying or attenuating; with Ashby's it states a bound. It calls this ordinary usage, citing Martin Pfiffner's *The Neurology of Business* (2022) printing the Beer form as the definition of the law with a footnote to the 1956 book. The manuscript adds Beer's own concession: asked whether anyone could use a variety measure in a real-life situation, he answered that they could not (HOE 86–87).

It then reads the good regulator theorem closely. The 1970 paper's authors qualified the universal claim of the title and noted that the proof mentions no inputs, channel, noise or dynamics; a disturbance distribution that changes only slowly excludes the non-stationary environments System Four exists for. The chapter reports the later readings of Baez (2016), Wentworth (2021) and Virgo and colleagues (2025), and assigns the result the theorem is believed to have proved to Francis and Wonham's internal model principle (1976). It turns the familiar complaint about an ignored System Four into a claim others could dispute: the model attributable to that regulator is trivial.

It also records an almost-uncited derivation, Aulin-Ahmavaara's law of requisite hierarchy (1979): 44 OpenAlex citations on 29 Sept 2026, against 1,065 for Conant and Ashby and 2,879 for Francis and Wonham. It calls citation counts a crude instrument, used only for order of magnitude. Finally it shows how Pfiffner (2017) operationalised the law: the items count nothing and ask whether an organization seems equal to what it faces.

## What the chapter puts at risk
1. **Receipt — one corrected citation practice; cost: free.** Stop presenting Conant and Ashby's title as a proved universal. Cite Francis and Wonham for robust regulation through an internal model, and Virgo and colleagues for the modern reconstruction.
2. A practice change, not an experiment: retired only by a proof that restores the universal claim under conditions relevant to organizational regulation.

## Beer locators
BOTF 1981: 308; DC 1966 (1994 reprint): 279; HOE 1979: 86–87, 88, 97, 158, 234–35, 286, 352, 355, 497; DTS 1985: 98; TBYT 2009: 52, 110–11.

## Status
Draft, *Punch and Judy* v0.5.0 — **not project canon**, and not published. The chapter states explicitly that none of it is an argument against Ashby, Beer or the VSM, only about our reading habits. Citation counts from one database are called crude. The Aulin derivation is described as not yet read closely against Beer's recursion claim, which the book says it does not do.

## Related
[Variety and regulation](https://wiki.cybernetic-futures.org/pure-vsm/concepts/variety-and-regulation), [Law of Cohesion](https://wiki.cybernetic-futures.org/pure-vsm/concepts/law-of-cohesion), [System Four](https://wiki.cybernetic-futures.org/pure-vsm/concepts/system-four), [System Five](https://wiki.cybernetic-futures.org/pure-vsm/concepts/system-five), [Decision and Control](https://wiki.cybernetic-futures.org/pure-vsm/entities/decision-and-control), [Punch and Judy — Overview](https://wiki.cybernetic-futures.org/punch-and-judy/overview), [Ch 2 — System Four Is Not a Pair of Eyes](https://wiki.cybernetic-futures.org/punch-and-judy/part-01-inside-the-model/ch02-system-four-not-eyes), [Ch 9 — Why None of This Ever Cost Us Anything](https://wiki.cybernetic-futures.org/punch-and-judy/part-01-inside-the-model/ch09-why-none-cost-us)