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      "licence": "publisher_terms",
      "review_status": "checked",
      "last_checked": "2026-08-09",
      "public_link_status": "public_link"
    },
    {
      "id": "src_conant_ashby_good_regulator_1970",
      "title": "Every Good Regulator of a System Must Be a Model of That System",
      "source_type": "primary_text",
      "quality_tier": "A",
      "access": "public",
      "url": "https://doi.org/10.1080/00207727008920220",
      "date": "1970",
      "notes": "Primary article text opened and inspected at Principia Cybernetica. Electronic transcription contains formatting errors in some equations. Locators here identify its PDF pages, not invented original journal page correspondence.",
      "creators": [
        "Roger C. Conant",
        "W. Ross Ashby"
      ],
      "doi": "10.1080/00207727008920220",
      "isbn": "",
      "publisher": "International Journal of Systems Science 1(2), 89–97",
      "licence": "publisher_terms",
      "archived_url": "",
      "content_hash": "",
      "review_status": "passage_checked_research_pass",
      "last_checked": "2026-10-29",
      "public_link_status": "public_link",
      "reading_url": "https://pespmc1.vub.ac.be/books/Conant_Ashby.pdf",
      "connection_pass": "depth_20261029",
      "source_locator": "Theorem, proof, and subsequent comments, electronic PDF pp. 8–9; section 5, Discussion",
      "access_note": "Electronic transcription contains formatting errors in some equations. Locators here identify its PDF pages, not invented original journal page correspondence."
    },
    {
      "id": "src_salah_grammar_part3_2022",
      "title": "Cybersecurity Lessons from The Grammar of Systems, part 3",
      "source_type": "public_secondary_summary",
      "quality_tier": "C",
      "access": "public",
      "url": "https://www.linkedin.com/pulse/cybersecurity-lessons-from-grammar-systems-order-chaos-osama-salah-2f",
      "date": "2022-06-01",
      "notes": "Public secondary summary of Grammar of Systems items 23–33. Used as an accessible orientation aid; the book remains the controlling source.",
      "creators": [
        "Osama Salah"
      ],
      "publisher": "LinkedIn",
      "licence": "publisher_terms",
      "review_status": "checked",
      "last_checked": "2026-08-09",
      "public_link_status": "public_link"
    },
    {
      "id": "src_salah_grammar_part1_2022",
      "title": "Cybersecurity Lessons from The Grammar of Systems, part 1",
      "source_type": "public_secondary_summary",
      "quality_tier": "C",
      "access": "public",
      "url": "https://www.linkedin.com/pulse/cybersecurity-lessons-from-grammar-systems-order-chaos-osama-salah/",
      "date": "2022-05-16",
      "notes": "Public secondary summary of Grammar of Systems items 1–11. Used as an accessible orientation aid; the book remains the controlling source.",
      "creators": [
        "Osama Salah"
      ],
      "publisher": "LinkedIn",
      "licence": "publisher_terms",
      "review_status": "checked",
      "last_checked": "2026-08-09",
      "public_link_status": "public_link"
    },
    {
      "id": "src_scio_grammar_case_multiple_disadvantage",
      "title": "Applying insight from Systems Laws to challenge thinking on, and service design for, the Multiple Disadvantage system",
      "source_type": "professional_case_study",
      "quality_tier": "C",
      "access": "public",
      "url": "https://www.systemspractice.org/resources/applying-insight-systems-laws-challenge-thinking-and-service-design-multiple-disadvantage",
      "date": "2026-01-01",
      "notes": "Public SCiO case illustrating the Law of Calling, Law of Sufficient Complexity and Conant-Ashby Theorem in practice.",
      "creators": [],
      "doi": "",
      "isbn": "",
      "publisher": "SCiO",
      "licence": "site_terms",
      "archived_url": "",
      "content_hash": "",
      "review_status": "checked",
      "last_checked": "2026-08-09",
      "public_link_status": "public_link"
    },
    {
      "id": "src_ashby_intro_cybernetics_1956",
      "title": "An Introduction to Cybernetics",
      "source_type": "primary_text",
      "quality_tier": "A",
      "access": "public",
      "url": "https://ashby.info/Ashby-Introduction-to-Cybernetics.pdf",
      "date": "1956",
      "notes": "Primary text opened and inspected. Title page identifies the 1957 second impression of the 1956 book. Use section numbers as the stable locator: the electronic PDF places two printed pages on each PDF page. Rights statement permits educational and research distribution with its notice; this packet links and paraphrases.",
      "creators": [
        "W. Ross Ashby"
      ],
      "doi": "",
      "isbn": "",
      "publisher": "Chapman & Hall",
      "licence": "archive_access_check_reuse",
      "archived_url": "https://www.ashby.info/",
      "content_hash": "",
      "review_status": "passage_checked_research_pass",
      "last_checked": "2026-10-29",
      "public_link_status": "public_link",
      "connection_pass": "depth_20261029",
      "source_locator": "1957 second impression; sections 11/5–11/11, printed pp. 205–209; PDF pp. 109–111",
      "access_note": "Use section numbers as the stable locator: the electronic PDF places two printed pages on each PDF page. Rights statement permits educational and research distribution with its notice; this packet links and paraphrases."
    },
    {
      "id": "src_ashby_archive_biography",
      "title": "Biography: W. Ross Ashby (1903–1972)",
      "source_type": "family_archive_history",
      "quality_tier": "B",
      "access": "public",
      "url": "https://ashby.info/biography.html",
      "date": "2008-01-01",
      "notes": "Biography by Ashby's daughter Jill, using Ashby's autobiographical notebook, family research and memories. It dates development of requisite variety to 1952–1953 and the writing of An Introduction to Cybernetics to 1952–1956.",
      "creators": [
        "Jill Ashby"
      ],
      "doi": "",
      "isbn": "",
      "publisher": "W. Ross Ashby Digital Archive",
      "licence": "site_terms",
      "archived_url": "",
      "content_hash": "",
      "review_status": "research_pass_needs_editor",
      "last_checked": "2026-08-09",
      "public_link_status": "public_link"
    }
  ],
  "evidence_locators": [],
  "reuse_note": "Preserve source attribution, scope, and review status. Source documents and evidence excerpts are excluded."
}