Tyrer Doctrine

The Tyrer Doctrine is the design principle of the Tyrer Framework, its prescription for the problem diagnosed by Tyrer's Law:

Systems should be engineered so that no critical environmental information is accessible through only a single sensory channel.

Principles

1. Accessibility is information integrity, not accommodation. Information in one channel only is a single point of failure, and redundancy across senses is required for the same reason as redundancy across servers.
2. Missing signals are system failures, not user limitations. A blind person who walks into an obstacle has not failed to see it; the environment failed to say so. This reframing decides where resources go and where accountability falls.
3. The deterministic floor is permanent; the generative ceiling is the frontier. Classical standards are the safety rail and are never replaced. Above them, generative systems raise the ceiling. "The floor holds the line. The ceiling raises it."

Application

It applies from the smallest component to the city: every control, status and piece of content reachable through at least two independent channels; semantic structure as a first-class property; a built world that communicates its state in more than one sense. It mandates no technology. "Information locked behind a single sense is information at risk."

On the web, the doctrine becomes the Single-Sense Rule of the Zero Information Casualty standard.

Behind the scenes

A real idea, from The Tyrer Framework, by Charli-Jo Tyrer (Carrados, 2026), Part Four. This entry summarises it; the paper is the authority.