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AEO Canon · the reference for answer-engine optimization

The Nine Properties of a Citable Passage

A citable passage is answer-first, self-contained, right-sized, specific, evidenced, single-purpose, plainly written, structurally clean, and well-headed. Here is each property with a before→after example — plus an interactive scorer that grades a paragraph you paste.

BBurke Atkerson2 min read

A citable passage has nine properties: it is answer-first, self-contained, right-sized, specific, evidenced, single-purpose, plainly written, structurally clean, and well-headed. Together they make a passage an engine can lift out of your page and repeat with confidence. Below is each one with a before→after example — and an interactive scorer that grades a paragraph you paste.

Your page
A passport renewal takes 6–8 weeks by standard mail.
extracted
The AI answer

A passport renewal takes 6–8 weeks by standard mail. You can expedite it for an added fee.

yoursite.com
Engines cite passages, not pages — write the sentence you want quoted, and put it first.

What are the nine properties?

The nine properties of a citable passage are the concrete, checkable traits that make your writing easy for an answer engine to extract. They are the writing-craft expression of extractability, the AEO Canon's third pillar. None is exotic; together they are decisive.

1. Answer-first

The complete answer appears in the first sentence, before any context. Profound found 44% of ChatGPT citations come from the first third of a page — lead with the answer or lose the citation.

Before

There are several things to consider when thinking about how often you should publish new content for AEO, and the right answer depends on a number of different factors.

After

For AEO, publish on a cadence matched to how fast your topic changes: weekly for fast-moving subjects like pricing or tools, monthly for stable evergreen topics. Frequency matters less than keeping time-sensitive pages current.

Why it works · The 'after' answers the question in sentence one; the 'before' promises an answer that never arrives.

2. Self-contained

The passage makes complete sense when read entirely on its own — no orphan pronouns, no dependence on the paragraph above.

Before

This is why it matters so much for the strategies we discussed earlier, and they all depend on getting it right.

After

Crawler access is the foundation of AEO because an engine cannot cite a page it cannot read. If GPTBot is blocked or your content only appears after JavaScript runs, every other optimization is wasted.

Why it works · The 'before' is built from orphan references — 'this,' 'they,' 'it' — that collapse when lifted. The 'after' names its subject and stands alone.

3. Right-sized (120–180 words)

The passage is long enough to answer fully and short enough to lift whole. SE Ranking associates roughly 120–180 words with AI citations. See how long a passage should be for the full breakdown.

4. Specific

The passage uses concrete numbers, names, and details instead of vague adjectives. "Three times faster" beats "much faster"; "GPTBot and ClaudeBot" beats "AI crawlers."

Before

Optimizing for speed can give you a significant advantage and help your content perform much better with AI engines.

After

SE Ranking found pages with a First Contentful Paint under 0.4 seconds earned about three times more AI citations than slower pages.

Why it works · Specificity is what an engine can quote. A vague claim is a sentence it has to soften; a specific one it can repeat as-is.

5. Evidenced

Each meaningful claim carries a statistic, quotation, or named source inline. The Princeton GEO study (arXiv 2311.09735) found quotations lifted visibility ~41%, statistics ~30%, and citing sources ~30%. This is the credibility pillar at the passage level.

6. Single-purpose

The passage answers exactly one question. Two questions in one block give the engine a muddy unit; split them so each is independently liftable. This is the core move in turning a page into a Q&A library.

7. Plainly written

Sentences are short and direct enough to parse without re-reading. Long, clause- stacked run-ons are hard for a human to follow and hard for a model to lift cleanly.

Before

While there are many considerations that go into the process, and despite the fact that the landscape is constantly changing in ways that can be difficult to predict, it is nevertheless generally advisable, in most cases, to lead with your answer.

After

Lead with your answer. The landscape changes constantly, but that move works in almost every case.

Why it works · Same point, half the friction. Plain sentences are easier for both readers and engines to extract.

8. Structurally clean

No keyword stuffing, no repeated phrases jammed in for density. The GEO study found keyword stuffing reduced AI visibility (~-10%) — the opposite of what writers hope. See does keyword stuffing help or hurt?

9. Well-headed

The passage sits under a heading phrased as the question it answers, which both signals the passage's purpose and matches how people query AI. Full method in how to use question-shaped headings.

Score your own passage

Paste a paragraph and the tool grades it against all nine properties in your browser. It is a heuristic estimate — useful for catching obvious misses, not a substitute for judgment.

Score your passage

Paste a paragraph below. It's scored in your browser against the nine properties of a citable passage — nothing is sent anywhere.

Your nine-point score appears here as you type.

How to read your score

Treat anything flagged red or amber as a prompt, not a verdict. The scorer can't judge whether your answer is correct or genuinely useful — only whether it has the surface traits of a liftable passage. A 9/9 passage that's wrong still won't earn trust; a 7/9 passage that nails the answer often will. Use it to remove friction, then rely on your own read.

Where this fits in the Canon

The nine properties are how you operationalize extractability and credibility as a writer. Start with the cornerstone, how to write content AI will quote, then go deep on the highest-leverage properties: answer-first sentences, question-shaped headings, and passage length.

Frequently asked questions

What makes a passage citable by AI?
Nine properties. A citable passage is answer-first (the answer is in sentence one), self-contained (it makes sense lifted out of context), right-sized (about 120–180 words), specific, evidenced (carries a stat, quote, or source), single-purpose (one question per passage), plainly written, structurally clean (no keyword stuffing), and well-headed (under a question-shaped heading). The more it has, the more liftable it is.
Which property matters most?
Answer-first. Profound found 44% of ChatGPT citations come from the first third of a page, so leading with the complete answer is the highest-leverage move. The other eight properties make that answer cleaner, safer, and easier to lift, but a buried answer fails before they matter.
How long should a citable passage be?
Roughly 120–180 words. SE Ranking's analysis associates that range with AI citations — long enough to answer one question completely, short enough for an engine to lift whole. Passages much shorter tend to be thin; much longer tend to cover several questions and get skipped.
Can I test whether my passage is citable?
Yes — the scorer on this page grades a pasted paragraph against all nine properties using client-side heuristics (nothing is sent anywhere). It is a rough estimate to catch obvious misses, not a guarantee. The surest test is still to read the passage aloud, alone, as the answer to one question.

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