{
  "title": "Adoption Timeline",
  "description": "Time-to-scale proxies across technology paradigms. The chart labels metric type and comparability so FORTRAN, ARPANET, iPhone, ChatGPT, and agentic tools are not treated as perfectly equivalent.",
  "fields": {
    "Year": "Launch year of technology or product",
    "Event": "Name of technology or product",
    "Category": "Technology category",
    "Days_to_Adoption": "Days to reach the stated proxy scale",
    "Impact": "Historical impact level",
    "adoption_metric_type": "Metric type: users, developers, devices, accounts, installs, or organizations",
    "comparability_level": "strict_proxy, comparable_proxy, rough_analogy, or projection",
    "source_id": "Source identifier for auditable rows",
    "confidence": "Qualitative confidence",
    "comparability_notes": "Why the proxy is or is not comparable with other rows",
    "notes": "Additional audit notes"
  },
  "sources": [
    {
      "id": "statista",
      "name": "Statista",
      "url": "https://www.statista.com/",
      "accessed": "2026-01",
      "notes": "User growth and adoption data"
    },
    {
      "id": "asymco",
      "name": "Asymco",
      "url": "http://www.asymco.com/",
      "accessed": "2026-01",
      "notes": "Historical technology adoption curves"
    },
    {
      "id": "epoch",
      "name": "Epoch AI",
      "url": "https://epochai.org/",
      "accessed": "2026-01",
      "notes": "AI adoption metrics"
    },
    {
      "id": "source_review_needed",
      "name": "Source review needed",
      "url": "https://github.com/mschwar/plots",
      "accessed": "2026-04",
      "notes": "Projection retained for chart continuity but flagged for source review"
    }
  ],
  "transformations": "Log10(days) for y-axis. Metric types and comparability levels control marker shape. Trend line is a visual guide, not a causal model.",
  "created": "2026-01",
  "last_updated": "2026-04-24",
  "author": "mschwar"
}