Access
Whether AI crawlers can reach the site at all, robots.txt policy, crawl permissions, retrieval access.
Abbreviated PTODA, the recognised short form of the Periodic Table of Digital Authority™.
A framework for classifying the observable signals of digital authority in the age of AI search, how machines find, read, trust and cite a business online.
The Periodic Table of Digital Authority™ (PTODA) is a conceptual framework that organises the signals an AI system can observe about an organisation into a single structured model. It names the signals, groups them, and describes how they relate, the way a periodic table organises elements into a legible whole.
It is a framework, not a score and not a product. It defines what can be observed and how those observations are organised. Everything else, measurement, benchmarking, commercial scoring, is built on top of it and is kept separate from it.
Two names do two jobs, and it is worth being precise about them.
The Periodic Table of Digital Authority™ is the framework, the protected intellectual model explained on this site.
PTODA is the abbreviation of that name, and also the name of the research programme that applies and extends the framework through published standards, benchmark panels and studies at ptoda.org.
The framework treats the web presence of an organisation as a set of observable signals. Each signal is something a machine can check directly, without judgement or interpretation. Grouped, they describe how discoverable, readable, trustworthy and citable an organisation is to an AI system.
This page describes the groups at a high level. The full signal set, definitions and relationships are documented in the framework's methodology and applied through the research programme.
The framework arranges signals into a hierarchy: primary signals that most directly affect whether an organisation can be found and cited, supporting signals that strengthen or qualify the primary ones, and emerging signals that are becoming relevant as AI systems evolve. The taxonomy is what makes the model a table rather than a list, position and grouping carry meaning.
The taxonomy is deliberately stable. It is versioned and changes rarely, so that research built on it remains comparable over time.
The framework is a living intellectual model, but a slow-moving one. It is documented with a version history so that any study or reference can point to the exact version it was built on. Major revisions are recorded; the framework is never silently altered.
This stability is the point. A framework that shifted underfoot would make longitudinal research meaningless. The Periodic Table of Digital Authority™ is designed to be the constant against which change in the world is measured.
The Periodic Table of Digital Authority™ is a coined framework and term originated by Douglas Lord and owned by Digital Dominator Pty Ltd. It may be referenced and cited with attribution for educational, journalistic and research purposes.
The framework name and mark may not be reproduced in full, used to build derivative frameworks, or applied in a product or service without permission. Detailed ownership, trade mark and licensing information is maintained in the company's legal register. For licensing enquiries, contact Digital Dominator Pty Ltd.
This site explains the framework. The research programme is where the framework is put to work, published standards, frozen benchmark panels, observable-signal studies and longitudinal measurement, all conducted under published governance.
PTODA is the research programme based on the Periodic Table of Digital Authority™.
Continue to PTODA.org →