Essential variables

Summary

Ashby identifies variables whose values must stay within limits for an organism to remain alive.

Implications for practice

In an organisational application, make the chosen viability conditions and their beneficiaries explicit.

Key distinctions

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Historical development

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Ideas it depends on

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Further developments

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Connections to practice

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Common confusions

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Further checks

• Extend the evidence pass beyond the cited passages.

Recorded connections

Check the wording, direction, scope, sources, and status of a connection before relying on it.

• Design for a Brain presents an account of Essential variables

  Status: candidate · Relation: presents account of

  Limited to the identified passage. A practice analogy needs its own assumptions and evidence.

  Locator: Section 3/14

  • Design for a Brain — 1954 corrected reprint of the 1952 edition (passage checked)

• Ultrastability uses critical limits on Essential variables

  Status: candidate · Relation: formalises

  Read in the context of Ashby’s particular model.

  Locator: Sections 3/14 and 8/4–8/7

  • Design for a Brain — 1954 corrected reprint of the 1952 edition (passage checked)

Sources and passage locators

• Design for a Brain — 1954 corrected reprint of the 1952 edition (passage checked)

Cite this entry

Taylor, B. P. (2026). Essential variables. The Necessary Tangle, release 0.35. https://transduction.systems/entries/concept_essential_variables/

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