When ChatGPT, Perplexity, or Google AI Overviews assembles an answer to a user query, the sources it cites are not chosen randomly. Large language models evaluate content against a complex set of trust and authority signals — some inherited from traditional search, others entirely unique to how LLMs process and prioritize information. TDS Geo Agency has mapped these signals into a proprietary 77-signal trust framework through original research.
What categories do the 77 trust signals fall into?
The framework spans six categories: structural signals (schema markup, HTML semantics, page architecture), content signals (question-answer format, citable sentence structure, topical authority), authority signals (E-E-A-T markers, named authors, verifiable credentials), technical signals (AI crawler access, robots.txt configuration, sitemap structure), citation flow signals (cross-property references, editorial backlinks, entity relationships), and freshness signals (publication dates, update frequency, temporal relevance markers).
Why do most brands fail at AI citation even with strong SEO?
Traditional SEO infrastructure — backlinks, keyword optimization, domain authority — accounts for only a fraction of what LLMs evaluate. The most common failure points are technical: AI crawlers blocked by default WordPress configurations (Yoast blocks GPTBot out of the box), missing structured data that machines need to parse content reliably, and content formatted for human scanning rather than machine extraction. A brand can rank #1 on Google and still be absent from every AI-generated answer.
How was the framework developed?
The 77-signal framework was developed through systematic testing across TDS Australia’s own network of properties — including Design Magazine, Ex Nihilo Magazine, and the parent studio site. Each signal was isolated and tested for its impact on citation frequency across ChatGPT, Perplexity, Google AI Overviews, Claude, and Gemini. The research confirmed that generative engine optimization requires a fundamentally different approach to content than traditional SEO.
The framework is now deployed for enterprise clients through TDS Geo Agency. Learn more about how AI search is reshaping brand discovery, or see the methodology in action with TDS Australia’s #1 ranking case study.
