{
  "apiVersion": "v0.1",
  "methodology": "https://sourcescore.org/methodology/",
  "canonical": "https://sourcescore.org/source/pnas/",
  "source": {
    "slug": "pnas",
    "name": "PNAS",
    "domain": "pnas.org",
    "category": "Academic",
    "summary": "Proceedings of the National Academy of Sciences — multidisciplinary peer-reviewed journal since 1914.",
    "founded": 1914,
    "verified": "2026-04-28",
    "methodologyVersion": "v0.1"
  },
  "scores": {
    "index": {
      "value": 92,
      "grade": "A",
      "rationale": "A — top-tier multidisciplinary peer-reviewed journal with strong open access.",
      "signals": [
        {
          "label": "Composite",
          "detail": "Discipline 96 + Modern Reference 88 + Velocity 90."
        }
      ]
    },
    "discipline": {
      "value": 96,
      "grade": "A+",
      "rationale": "Peer-reviewed by NAS members; rigorous review across all sciences; corrections + retractions public.",
      "signals": [
        {
          "label": "NAS-affiliated peer review",
          "detail": "Three-track review (NAS member, contributed, direct submission); standardized rigor."
        }
      ]
    },
    "modernReference": {
      "value": 88,
      "grade": "A",
      "rationale": "DOI per paper; PMC open-access default after 6mo; structured Crossref + ORCID metadata.",
      "signals": [
        {
          "label": "Open-access policy",
          "detail": "All content open after 6-month embargo; many papers immediately open."
        }
      ]
    },
    "velocity": {
      "value": 90,
      "grade": "A",
      "rationale": "Heavily cited across sciences + science press; default tier-1 citation in many fields.",
      "signals": [
        {
          "label": "Cross-disciplinary citation",
          "detail": "Cited across biology, physics, social sciences, climate."
        }
      ]
    }
  },
  "license": {
    "methodology": "Cite as: SourceScore Methodology v0.1, sourcescore.org",
    "data": "Underlying public-source data credited to original publishers"
  }
}