Applicability Terminology Reference

Status: Canonical terminology reference (non-claim)

Purpose: This page establishes the canonical terminology used within the doctrine of operational applicability boundaries. No implementation details are provided.

Section 1 — Applicability Boundary

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

An applicability boundary is not a failure point. It is the point at which the conditions that justify the operational mode are no longer met.

Section 2 — Operational Mode

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

An operational mode may be valid or invalid depending on whether the conditions under which it was defined continue to hold.

Section 3 — 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.

An invalid operational mode does not necessarily produce errors. The system may behave correctly while operating illegitimately.

Section 4 — Applicability Architecture

A conceptual framework that describes systems defining boundaries of operational legitimacy.

Applicability Architecture concerns validity of operational modes rather than behavioural correctness. It does not describe technical components or system interfaces.

Section 5 — Behaviour vs Legitimacy

Behaviour describes whether a system performs its functions correctly.

Legitimacy describes whether a system's operational mode is valid within its defined conditions.

These are independent conditions. A system may be behaviourally correct and operationally illegitimate.

Canonical Statement

These terms form part of the conceptual doctrine of operational applicability boundaries.

The terminology is used to describe the legitimacy conditions of operational modes.

Non-Claim Integrity

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

End of Applicability Terminology Reference