{
  "schema_version": 1,
  "concept_key": "dirty",
  "minimum_approved": 6,
  "briefs": [
    {
      "asset_key": "dirty_isolated_01",
      "purpose": "identification",
      "difficulty": 1,
      "brief": "One clear, realistic dirty centred on a plain neutral background; whole target visible; no text or logo.",
      "status": "brief_ready"
    },
    {
      "asset_key": "dirty_natural_context_01",
      "purpose": "meaning",
      "difficulty": 1,
      "brief": "A realistic everyday scene where dirty is the unambiguous target; simple background and one relevant contextual cue.",
      "status": "brief_ready"
    },
    {
      "asset_key": "dirty_variation_01",
      "purpose": "generalisation",
      "difficulty": 2,
      "brief": "A meaningfully different valid example of dirty—different instance, actor, form, size or setting without changing the concept.",
      "status": "brief_ready"
    },
    {
      "asset_key": "dirty_viewpoint_01",
      "purpose": "generalisation",
      "difficulty": 2,
      "brief": "The same concept dirty from a different viewpoint or distance, still fully recognizable and naturally lit.",
      "status": "brief_ready"
    },
    {
      "asset_key": "dirty_context_complex_01",
      "purpose": "discrimination",
      "difficulty": 3,
      "brief": "Dirty in a moderately busy but realistic setting; target remains visible without positional or colour cueing.",
      "status": "brief_ready"
    },
    {
      "asset_key": "dirty_unfamiliar_01",
      "purpose": "generalisation_probe",
      "difficulty": 3,
      "brief": "A novel valid exemplar of dirty unlike the teaching set, suitable for an unprompted generalisation probe.",
      "status": "brief_ready"
    }
  ]
}