{
  "schemaVersion": "persona-recurring-instrument.v1",
  "id": "instrument-brand-tracker-v1",
  "bundleId": "persona-recurring-evidence-2026-10-01",
  "status": "fixture_ready",
  "synthetic": true,
  "customerEvidence": false,
  "title": "Synthetic three-wave brand tracker",
  "method": "Repeated cross-sectional brand tracking pulse",
  "cadence": "monthly",
  "waveIds": ["brand-2026-07", "brand-2026-08", "brand-2026-09"],
  "minimumReportableBase": 30,
  "sourceBindings": {
    "personaExampleIds": ["marketing-brand-tracking-pulse"],
    "templateIds": ["demo-template-brand-tracking-pulse"],
    "backendTemplateKeys": ["brand-perception-study"],
    "fixturePaths": ["survey-frontend/lib/demo-templates.ts"]
  },
  "stableMeasures": [
    {
      "questionId": "brand-q1-aided-awareness",
      "type": "multi_choice",
      "measureId": "aided_awareness_pct",
      "prompt": "Which of these research platforms have you heard of?"
    },
    {
      "questionId": "brand-q2-consideration",
      "type": "single_choice",
      "measureId": "consideration_pct",
      "prompt": "Which platforms would you consider for your next research project?"
    },
    {
      "questionId": "brand-q3-preference",
      "type": "single_choice",
      "measureId": "first_preference_pct",
      "prompt": "Which platform would you consider first?"
    },
    {
      "questionId": "brand-q4-trust",
      "type": "rating_5",
      "measureId": "trust_mean",
      "prompt": "How much do you trust this platform to preserve research context?"
    }
  ],
  "comparabilityPolicy": {
    "lockedQuestionIds": [
      "brand-q1-aided-awareness",
      "brand-q2-consideration",
      "brand-q3-preference",
      "brand-q4-trust"
    ],
    "allowedWaveChanges": ["sample allocation", "fieldwork dates", "rotating open-ended probe"],
    "breakInSeriesRule": "Any wording, response-scale, audience, or weighting change must create a new series identifier."
  },
  "evidenceCaption": "Illustrative product evidence using deterministic synthetic data. It is not a customer result or outcome claim.",
  "nonCausalBoundary": "Observed movement is descriptive and does not establish that marketing exposure or campaign activity caused brand change."
}