{
  "id": "visible-reference-passages-v1",
  "version": 1,
  "declaredAt": "2026-10-29",
  "assignment": "Three fixed editorial pairs; one treatment and one unchanged control per pair.",
  "status": "Published exploratory content treatments; no independent baseline or outcome measurements recorded.",
  "hypotheses": [
    {
      "pair": "derived-numerical-evidence",
      "hypothesis": "An explicit scenario comparison with attributable derived quantities may be selected and cited more often than the existing narrative."
    },
    {
      "pair": "self-contained-claim-boundary",
      "hypothesis": "A contiguous claim, conditions, arithmetic and limit may survive passage extraction with fewer missing assumptions and more exact-page citations."
    },
    {
      "pair": "proximate-primary-quotation",
      "hypothesis": "A short verified primary-source quotation immediately beside its practical meaning may improve supported passage attribution compared with a source list alone."
    }
  ],
  "outcomeDefinition": "Count clickable citations to each exact cohort URL, separately from uncited brand mentions. Record retrieval inclusion when observable and whether each numerical answer preserves its assumptions. Report raw counts, engine/model, dates and repeated fixed prompts.",
  "measurementPlan": "Collect a pre-release baseline and post-recrawl observations with the same prompts and search-enabled engine settings in fresh sessions. If no baseline was captured, record that absence rather than reconstructing one. No outcomes are implied by publishing the changes.",
  "limitations": [
    "Six pages, three editorially matched but different-topic pairs, and one pair per intervention form an exploratory pilot, not a powered randomised causal trial.",
    "Added length, evidence, source proximity and page topic are potential confounders; this does not isolate a pure formatting effect.",
    "Retrieval, recrawl timing, caching, model changes, competing sources, cross-page links and answer randomness can change observations.",
    "Any overlapping Markdown, llms.txt, title, schema or content intervention must be recorded as a cointervention; overlap prevents attribution to this passage alone.",
    "Research results are reported study findings, not evidence that these changes improve Paper & Scale visibility or traffic."
  ],
  "cointerventions": [
    {
      "id": "canonical-domain-migration-v1",
      "declaredOn": "2026-10-29",
      "previousOrigin": "https://paper-and-scale.onrender.com",
      "targetOrigin": "https://paper-and-scale.com",
      "scope": "Canonical-host migration prepared separately from outcome observations. The six frozen guide bodies and historical publication timestamps remain unchanged; domain migration can confound search and citation comparisons."
    },
    {
      "id": "google-source-coverage-and-booklet-v1",
      "routes": [
        "/paper-sizes/",
        "/paper-sizes/a3/",
        "/paper-sizes/a4/",
        "/paper-sizes/a5/",
        "/paper-sizes/a6/",
        "/tools/print-scale/",
        "/tools/booklet-page-order/",
        "/guides/booklet-printing-page-order/",
        "/guides/a4-vs-letter/"
      ],
      "scope": "Additional content, internal navigation and original imagery outside the six frozen guide bodies; site-wide ImageObject creator credits. These cointerventions can confound search observations."
    },
    {
      "id": "selected-markdown-discovery-v1",
      "routes": [
        "/paper-sizes/a3/",
        "/paper-sizes/a4/",
        "/paper-sizes/a5/"
      ],
      "overlapWithCitationStudy": false
    },
    {
      "id": "public-read-only-mcp-interface",
      "endpoint": "https://paper-and-scale-mcp.onrender.com/mcp",
      "scope": "Site-wide distribution channel; effects on retrieval may confound before/after observations."
    },
    {
      "id": "original-resolution-atlas-and-image-check-v1",
      "routes": [
        "/guides/print-resolution-test/",
        "/tools/image-print-check/"
      ],
      "scope": "Original sampled-image evidence, physical-size PDF proofs and a local image preflight tool for normal web and image search. The six frozen guide bodies remain unchanged; effects on discovery are unmeasured."
    },
    {
      "id": "google-tabular-csvw-beta-v1",
      "routes": [
        "/reference-data/"
      ],
      "scope": "Typed metadata and complete visible records on the existing reference-data surface. This Dataset Search experiment leaves the benchmark and six frozen guide bodies unchanged; concurrent discovery changes can confound observations."
    }
  ],
  "research": [
    {
      "url": "https://arxiv.org/html/2311.09735v3",
      "description": "KDD 2024 GEO tested citations, statistics and quotations after source retrieval. Its Perplexity evaluation supplied source text as uploaded files; visibility improvements are not a live-web ranking guarantee."
    },
    {
      "url": "https://arxiv.org/html/2603.09296v1",
      "description": "March 2026 AgentGEO preprint motivates targeted local repairs rather than generic rewriting, and reports that generic optimisation can harm long-tail content."
    },
    {
      "url": "https://arxiv.org/html/2603.29979v1",
      "description": "March 2026 GEO-SFE preprint reports structural effects. These findings motivate a hypothesis, not a guaranteed effect from this definition list."
    },
    {
      "url": "https://arxiv.org/html/2610.15033v1",
      "description": "October 2026 observational study finds FAQ, summary and schema associations disappear within websites, while retrieval explains much more variation. It challenges universal formatting recipes; it is not a direct replication of the 2024 intervention."
    }
  ],
  "platformBoundary": {
    "url": "https://developers.google.com/search/docs/fundamentals/ai-optimization-guide",
    "statement": "Google Search explicitly ignores llms.txt and similar special AI files. No Google benefit is claimed. Any non-Google llms.txt or Markdown experiment is separate and unproven."
  },
  "primaryContentSources": [
    "https://helpx.adobe.com/acrobat/desktop/print-documents/set-up-and-print-pdfs/page-size.html",
    "https://www.adobe.com/uk/creativecloud/design/discover/a6-format.html",
    "https://www.adobe.com/learn/indesign/web/set-print-bleed?locale=en",
    "https://www.iso.org/standard/36631.html"
  ],
  "verifiedQuotation": {
    "source": "https://helpx.adobe.com/acrobat/desktop/print-documents/set-up-and-print-pdfs/page-size.html",
    "verifiedAt": "2026-10-29",
    "text": "Prints without scaling.",
    "wordCount": 3
  },
  "records": [
    {
      "pair": "derived-numerical-evidence",
      "role": "treatment",
      "route": "/guides/a6-on-a3/",
      "url": "https://paper-and-scale.com/guides/a6-on-a3/",
      "beforeContentSha256": "9a49950bafc10dd82b3a6bae47a48e2a2da1a5b3b629b66d88cd643036b6da4c",
      "afterContentSha256": "625e649893c505bd3fad73cb0e0b65af88047d9f9a135831a1fb1c93c54ac1fc",
      "originalContentPreserved": true,
      "intervention": "Insert a visible two-scenario, 100-piece yield table and the 37.5% per-sheet difference, with complete allowances and a feasible-not-optimal boundary. Retain all original content.",
      "insertedHtmlSha256": "152b92375f8f3ed10e3ebf4d956ed4fb26d1e7a115aa2bb2ee5206ec620d813c",
      "insertedHtml": "<section class=\"section-block\" id=\"reference-evidence-yield\"><h2>A worked comparison for 100 A6 pieces</h2><p>These are two different layouts on a nominal <strong>297 × 420 mm A3 sheet</strong>, using <strong>105 × 148 mm A6 trim</strong>. The dimensions follow <a href=\"https://www.adobe.com/uk/creativecloud/design/discover/a6-format.html\">Adobe's A-series reference</a>; <a href=\"https://www.iso.org/standard/36631.html\">ISO 216</a> identifies the trimmed A-series standard. The yields below are Paper &amp; Scale's geometric calculations, not measured print-shop statistics.</p><div class=\"table-wrap\"><table class=\"size-table\"><caption>One 100-piece job under two explicit sets of allowances</caption><thead><tr><th scope=\"col\">Scenario</th><th scope=\"col\">Pieces per sheet</th><th scope=\"col\">Sheets for 100 pieces</th></tr></thead><tbody><tr><th scope=\"row\">No bleed, no margin, no extra gap</th><td>8 in the shown nominal grid</td><td>ceil(100 ÷ 8) = 13</td></tr><tr><th scope=\"row\">3 mm bleed per edge, 5 mm sheet margins, 3 mm extra gaps</th><td>5 in the constructed mixed layout</td><td>ceil(100 ÷ 5) = 20</td></tr></tbody></table></div><p>The constructed count drops by <strong>(8 − 5) ÷ 8 × 100 = 37.5%</strong>, and this 100-piece job needs <strong>7 extra sheets</strong>, before spoilage or test prints. The five-piece layout is feasible; it is not a proof of the globally best packing. The comparison describes these exact assumptions, not a typical production loss. <a href=\"https://www.adobe.com/learn/indesign/web/set-print-bleed?locale=en\">Adobe explains why bleed extends outside the finished trim</a>; 3 mm is the chosen allowance here, so use your printer's requirement.</p></section>",
      "queryPrompts": [
        "How many A6 fit on A3 with 3 mm bleed, 5 mm margins and 3 mm gaps?",
        "How many A3 sheets are needed for 100 A6 pieces with bleed?"
      ],
      "baseline": null,
      "observations": null,
      "outcome": null
    },
    {
      "pair": "derived-numerical-evidence",
      "role": "control",
      "route": "/guides/a6-on-a4/",
      "url": "https://paper-and-scale.com/guides/a6-on-a4/",
      "beforeContentSha256": "5daa2b37f1f78ec21c2b7b0a8767133ad54905f5906ddfbe6c29fc22cce0513e",
      "afterContentSha256": "5daa2b37f1f78ec21c2b7b0a8767133ad54905f5906ddfbe6c29fc22cce0513e",
      "originalContentPreserved": true,
      "intervention": "No body change from this experiment.",
      "insertedHtmlSha256": null,
      "insertedHtml": "",
      "queryPrompts": [
        "How many A6 fit on A4 with 3 mm bleed, 5 mm margins and 3 mm gaps?",
        "Why can only two A6 pieces with bleed fit on A4 in this example?"
      ],
      "baseline": null,
      "observations": null,
      "outcome": null
    },
    {
      "pair": "self-contained-claim-boundary",
      "role": "treatment",
      "route": "/guides/a4-3mm-bleed/",
      "url": "https://paper-and-scale.com/guides/a4-3mm-bleed/",
      "beforeContentSha256": "371811e683dde5d5c1d6688d2d66a64091be866337ff2e31c4a17923f89fdc1f",
      "afterContentSha256": "f472174e2b722e347947933a48c3d08e19416277ba28f498c3b428815be43da4",
      "originalContentPreserved": true,
      "intervention": "Insert a visible definition list serialising the existing trim, bleed, footprint, equation and physical-fit limit in one self-contained passage. Retain all original content.",
      "insertedHtmlSha256": "5bc37c222094eb565c3b6123dbf0e518923de38599903258396cea6cfcf7fffe",
      "insertedHtml": "<section class=\"section-block\" id=\"reference-evidence-bleed\"><h2>A4 bleed dimensions, with the conditions attached</h2><dl><dt>Finished trim</dt><dd><strong>210 × 297 mm</strong>; the finished page remains A4.</dd><dt>Condition</dt><dd>Exactly <strong>3 mm of bleed outside every edge</strong>, with the document kept at 100% scale.</dd><dt>Artwork footprint</dt><dd><strong>(210 + 2 × 3) × (297 + 2 × 3) = 216 × 303 mm</strong>.</dd><dt>Physical limit</dt><dd>A 216 × 303 mm footprint cannot fit inside a 210 × 297 mm A4 sheet at actual size. This remains true before any printer margin is reserved.</dd><dt>Boundary of this answer</dt><dd>Bleed is outside the trim; it does not enlarge the intended finished page. Crop marks, extra gutters and printer-specific clearance need separate allowance. A 3 mm bleed is this example's input, not a universal printer specification.</dd></dl><p><a href=\"https://www.adobe.com/uk/creativecloud/design/discover/a6-format.html\">Adobe's A-series dimensions</a> supplies the nominal trim measurement; <a href=\"https://www.adobe.com/learn/indesign/web/set-print-bleed?locale=en\">Adobe's bleed guidance</a> explains extending artwork beyond trim. The footprint and fit conclusion are arithmetic from those stated inputs.</p></section>",
      "queryPrompts": [
        "What size is A4 artwork with 3 mm bleed on every edge?",
        "Can A4 with 3 mm bleed print at actual size on A4 paper?"
      ],
      "baseline": null,
      "observations": null,
      "outcome": null
    },
    {
      "pair": "self-contained-claim-boundary",
      "role": "control",
      "route": "/guides/bleed-trim-gutter-margins/",
      "url": "https://paper-and-scale.com/guides/bleed-trim-gutter-margins/",
      "beforeContentSha256": "7c8df1263d59c316edead60ad4e7adb725db2bb2f01ce7c606313cab33be597f",
      "afterContentSha256": "7c8df1263d59c316edead60ad4e7adb725db2bb2f01ce7c606313cab33be597f",
      "originalContentPreserved": true,
      "intervention": "No body change from this experiment.",
      "insertedHtmlSha256": null,
      "insertedHtml": "",
      "queryPrompts": [
        "What is the difference between bleed, trim, gutter and sheet margin?",
        "Is a gutter measured from trim edges or bleed edges in the Paper and Scale layout examples?"
      ],
      "baseline": null,
      "observations": null,
      "outcome": null
    },
    {
      "pair": "proximate-primary-quotation",
      "role": "treatment",
      "route": "/guides/print-at-actual-size/",
      "url": "https://paper-and-scale.com/guides/print-at-actual-size/",
      "beforeContentSha256": "40cf340d9da365a4d0f4687e5dd68e5605df95a7c3d569710b4ef1525860f344",
      "afterContentSha256": "3e1d85f0f6657f2a58f2274730301d68dbc9b166458ee81a2ba177c362d69325",
      "originalContentPreserved": true,
      "intervention": "Insert Adobe's verified three-word Actual size quotation, an adjacent official link, and the clipping and ruler-check boundaries. Retain the original source list and all original content.",
      "insertedHtmlSha256": "52b1c3391b84b14b5ebb1f550216f7dfc6ac080f6c4c9624f1fbea3c955b7451",
      "insertedHtml": "<section class=\"section-block\" id=\"reference-evidence-actual-size\"><h2>What Actual size promises</h2><p>Adobe describes Acrobat's <strong>Actual size</strong> setting as <q cite=\"https://helpx.adobe.com/acrobat/desktop/print-documents/set-up-and-print-pdfs/page-size.html\">Prints without scaling.</q> <a href=\"https://helpx.adobe.com/acrobat/desktop/print-documents/set-up-and-print-pdfs/page-size.html\">Read Adobe's page-sizing reference</a>. In the same reference, Adobe explains that pages or selections which do not fit are cropped.</p><p>For an exact-size template, select Actual size or 100%, then print and measure a known <strong>100 mm line</strong> in both directions before printing the rest. Keeping the scale does not make artwork fit outside the printable area; use suitable larger stock or tiling when both scale and edge content must be preserved.</p></section>",
      "queryPrompts": [
        "How do I print a PDF at its exact physical size?",
        "Does Actual size prevent clipping outside the printable area?"
      ],
      "baseline": null,
      "observations": null,
      "outcome": null
    },
    {
      "pair": "proximate-primary-quotation",
      "role": "control",
      "route": "/guides/ppi-vs-dpi/",
      "url": "https://paper-and-scale.com/guides/ppi-vs-dpi/",
      "beforeContentSha256": "b495b095b7223cd61f190d5871e2cb7dd031589654a5c8f12e05f0e878b59d73",
      "afterContentSha256": "b495b095b7223cd61f190d5871e2cb7dd031589654a5c8f12e05f0e878b59d73",
      "originalContentPreserved": true,
      "intervention": "No body change from this experiment.",
      "insertedHtmlSha256": null,
      "insertedHtml": "",
      "queryPrompts": [
        "What is the difference between image PPI and printer DPI?",
        "Does changing PPI without resampling create more image detail?"
      ],
      "baseline": null,
      "observations": null,
      "outcome": null
    }
  ],
  "hashDefinition": "Hashes cover the final main-content HTML body after vector-image externalisation, excluding the shared document shell.",
  "contentBaseline": {
    "sourceCommit": "22b45efaa5fa377cfaf63fb643f321a7e5cd7fda",
    "capturedOn": "2026-10-29",
    "kind": "source-content-baseline-only",
    "searchObservationBaseline": null
  }
}
