Rating

★★★★★

Category

non-fiction

Read

2026-05-08

Pages

320

Most thought-provoking book on management I’ve read in a while.

Requisite Variety

Variety is the number of possible states a system can be in, but think more the vibe of it (an organisation has more variety than a person, which has more than a light switch) rather than as an information-theoretic definition.

Ashby’s law of Requisite Variety states that only variety can absorb variety. You cannot control something more complex than your own capacity to respond.

If a manager or management team doesn’t have information-handling capacity at least as great as the complexity of the thing they’re in charge of, control is not possible and eventually, the system will become unregulated.

Incoming variety can be attenuated to make it more manageable: dashboards, KPIs, reporting structures are all attenuation techniques. Your own variety, or capacity to generate responses, can be amplified: empowering frontline staff, building flexible systems.

Attenuating too aggressively filters out important information. Amplifying without structure leads to chaos.

Viable System Model

Stafford Beer’s Viable System Model describes five different interacting systems within an organisation, which ultimately are how they match their variety to their environment.

System 1 (Operations) performs primary value-creating activities.

System 2 (Regulation or Coordination) helps System 1 units not trip over themselves. Rostering, style guides, basic short-term planning.

System 3 (Integration) brings everything together. Who gets what resources, for what, making sure the various sub-systems come together into something cohesive.

With no adequate System 3 function, the operating units have no means to resolve their conflicts other than through internal politics, with resources allocated by grabbing and hoarding them.

System 4 (Intelligence) looks outward and into the future. What is happening in the external environment that could destabilise or create opportunity?

The variety transmitted from the intelligence function needs to be matched both to the change it anticipates in the environment and to the capacity of the operational function to reorganise itself.

A real System 4, though, is explicitly concentrated on those parts of the environment that aren’t yet relevant to what it’s doing.

System 5 (Identity) sets overall purpose. Why are we here?

Having a consistent identity is a great way of reducing the variety you need to deal with, because it means that there are a lot of possibilities that can be simply ignored.

In practice, these systems aren’t necessarily distinct functions. For example:

Stafford Beer occasionally seemed to suggest that this kind of informal internal networking could be the best way to create System 3, which was why a big lounge at head office with whisky and cigars was important.

Also, the model recurses up and down an organisation, depending on what you are trying to understand. An operations function will likely have its own unique identity driven by its own System 5, and an entire organisation might be a System 1 in the context of the economy.

All systems need to be present:

The overlapping of different systems – and the tendency of individuals to have different roles at different levels of abstraction – is a key part of Beer’s theory… every ‘viable system’ needs to have all five of the functions described so far in order to be capable of long-term survival.

Unaccountability

There are amazingly few occasions in everyday business life when someone makes a specific and important decision as a creative act. The daily grind of working life is the selection of the option that looks least obviously disastrous, according to a set of criteria laid out in a plan that was produced elsewhere.

But of course, you can’t be fair to an average; fairness or unfairness happens to individuals.

Conclusion of an investigation into an education scandal in the UK, on the theme of “these investigations are rarely going to find anything”:

No satisfactory answer to this question was ever given. Everyone involved seemed to have been performing the task assigned to them to the best of their abilities. Nobody ever gave the order to optimise the system to fit to the curve – but nobody ever suggested that there might be other possible criteria of fairness. The minister responsible defended his senior staff before firing them. He was later knighted.

The author concludes that we are rapidly losing the battle for personal accountability, and have likely already lost. We need to focus on systems instead.

In the future, as well as being made by unaccountable black box systems, important decisions are going to be made by actual robots. We cannot afford the luxury of explainability; we can’t keep on demanding that an identifiable human being is available to blame when things go wrong.

My only guess is that it might be that what’s really intolerable about unaccountability is the broken feedback link, and that if we can solve the problem of communicating with the system – pay more attention to the ‘red-handle alert’ mechanisms that indicate an unbearable outcome – people might not be so furious about the death of personal responsibility.

Purpose of an Organisation

Good chapter on the history on “value maximization,” the drivers (private equity), the problems, and what to do about it. I regrettably didn’t highlight much except this conclusion though:

Organisations and systems can be like people, having purposes without a single goal. An artist doesn’t have a successful career by maximising their art; they do it by repeatedly producing work that they are proud of. Businesses ought to be like artists, not paperclip maximisers.

Good Quotes

One of the things that got economists a bad reputation was an excess of enthusiasm for applying their methods to things people really cared about.

Everyone who has put together a business plan knows that if you can’t fudge the key assumptions to justify the decision your boss wants to make, you don’t know enough about the business.

Criticising the consultant for selling the company’s own insights back to them is like complaining to your hairdresser that they’ve only cut away something that was yours.