Terminology Authority

Status: Terminology reference (non-claim)

Purpose: This page defines the canonical terminology used within the Applicability Boundary Doctrine.

Introduction

The following terminology is defined within the Applicability Boundary Doctrine.

These terms describe structural properties of complex automated, AI-enabled and safety-critical systems, including systems operating in regulated or high-consequence environments.

Terminology

Applicability Boundary

The limit beyond which a system's operational mode can no longer be considered valid under its stated assumptions.

Operational Mode

A defined configuration of system behaviour that determines how the system operates within its environment at a given time.

Invalid Operational Mode

A state in which a system continues to function but operates outside the conditions under which its behaviour can be considered legitimate.

Behaviour Governance

The framework that defines what a system should do. Behaviour governance operates through authority and prescribes operational requirements.

System Legitimacy

The condition in which a system's operational mode is valid within its defined applicability boundary. Legitimacy is independent of behavioural correctness.

Operational Assumptions

The conditions that must hold for an operational mode to remain valid. When operational assumptions are no longer met, the applicability boundary has been crossed.

Applicability Architecture

A conceptual framework that describes systems defining boundaries of operational legitimacy. Applicability Architecture concerns validity of operational modes rather than behavioural correctness.

Terminology Notice

The terminology used in this doctrine, including the terms Applicability Boundary, Operational Mode, Invalid Operational Mode, Behaviour Governance and Applicability Architecture, forms part of the conceptual framework known as the Applicability Boundary Doctrine.

These terms are used to describe structural properties of complex automated, AI-enabled and safety-critical systems, including systems operating in regulated or high-consequence environments.

Related Pages

• Canonical Definition — Applicability Boundary.
• Glossary — Complete terminology reference with extended definitions.

Closing Statement

These terms form part of the conceptual framework presented in the Applicability Boundary Doctrine.

Non-Claim Integrity

This page is non-claim. It does not prescribe actions, recommend implementations, or define technical requirements.

End of Terminology Authority