{
  "schema": "vedokrok.public-item.v1",
  "release_id": "MHC-RPUB-20260920-75ad787a",
  "url": "/knowledge/separate-range-accuracy-and-fluency-before-fixing-the-plateau",
  "id": "MHC-D-RESEARCH-1121",
  "version": "0.1.0",
  "title": "Separate range, accuracy and fluency before fixing the plateau",
  "summary": "One level label can hide three different training problems.",
  "kind": "heuristic",
  "body": "Diagnose whether the bottleneck is lack of linguistic options, unstable accuracy or slow retrieval. Range asks whether you can express the idea in several appropriate ways. Accuracy asks whether the form remains controlled under load. Fluency asks whether useful language is available quickly enough for continuous performance. A practice task should make the chosen dimension visible instead of rewarding a different one.",
  "limits": [
    "The dimensions interact. Separating them is a diagnostic move, not a claim that language performance can be trained in isolation."
  ],
  "topics": [
    "union-language-plateau-and-c1-transition"
  ],
  "intents": [],
  "source_ids": [
    "RS-F53492D1107B1940",
    "RS-59C42B630ECEE225"
  ],
  "evidence": [
    {
      "claim": "CEFR descriptors distinguish C1 from B2 through broader linguistic range, higher grammatical control, more effortless fluency, a larger repertoire of discourse functions and more controlled coherence.",
      "source_id": "RS-F53492D1107B1940",
      "role": "supports",
      "note": "CEFR describes performance; it does not prescribe a training method or a fixed number of study hours.",
      "locator": "B2 and C1 rows"
    },
    {
      "claim": "Task-repetition research finds that repeating a communicative task can improve dimensions of L2 performance, while the size and pattern of effects depend on the task and repetition design.",
      "source_id": "RS-59C42B630ECEE225",
      "role": "supports",
      "note": "Immediate improvement on a repeated task can include task familiarity and does not by itself prove transfer to new topics.",
      "locator": "Meta-analysis results"
    }
  ],
  "use_when": [
    "A learner's speaking or writing sounds 'not advanced enough,' but different weaknesses are being mixed together."
  ],
  "avoid_when": [
    "The dimensions interact. Separating them is a diagnostic move, not a claim that language performance can be trained in isolation."
  ],
  "example": "Knowing several conditional forms is not the same as selecting one accurately while answering a surprise follow-up question.",
  "check": "The next exercise has a primary target that is visible in the output: range, accuracy or fluency.",
  "sources": [
    {
      "id": "RS-F53492D1107B1940",
      "title": "Qualitative aspects of spoken language use - CEFR Table 3",
      "url": "https://www.coe.int/en/web/common-european-framework-reference-languages/table-3-cefr-3.3-common-reference-levels-qualitative-aspects-of-spoken-language-use"
    },
    {
      "id": "RS-59C42B630ECEE225",
      "title": "Meta-analysis of task repetition effects on second-language oral performance",
      "url": "https://www.sciencedirect.com/science/article/pii/S0346251X25002787"
    }
  ],
  "relations": [
    {
      "from": "MHC-D-RESEARCH-1121",
      "to": "MHC-D-RESEARCH-1122",
      "type": "use_before",
      "url": "/knowledge/run-one-bottleneck-cycle-instead-of-adding-more-general-exposure"
    }
  ],
  "collections": [
    {
      "id": "RC-67F995255A634179",
      "title": "Move from a B2 plateau toward C1 performance",
      "url": "/collections/move-from-a-b2-plateau-toward-c1-performance"
    }
  ]
}