{
  "schema": "vedokrok.public-item.v1",
  "release_id": "MHC-RPUB-20260920-75ad787a",
  "url": "/knowledge/block-briefly-when-the-pattern-is-still-forming",
  "id": "MHC-D-RESEARCH-9012",
  "version": "0.1.0",
  "title": "Block briefly when the pattern is still forming",
  "summary": "Contrast helps after there is something stable enough to contrast.",
  "kind": "principle",
  "body": "Use a short blocked introduction when the learner cannot yet identify the basic structure of each option. Once the patterns are recognizable, introduce mixed cases that require selection. The transition point comes from performance, not a fixed number of repetitions.",
  "limits": [
    "Blocking can also create false fluency if it continues too long. Retest with mixed cases once the basic structure is available."
  ],
  "topics": [
    "union-skill-acquisition-career-dominant-focus"
  ],
  "intents": [],
  "source_ids": [
    "RS-B82676FFC4E6D020"
  ],
  "evidence": [
    {
      "claim": "A meta-analysis of interleaving found a moderate overall benefit (g = 0.42) but strong moderation by material type and category similarity, including conditions where blocking performed better.",
      "source_id": "RS-B82676FFC4E6D020",
      "role": "supports",
      "note": "Interleaving should be selected for a discrimination problem rather than used as a universal mixing rule.",
      "locator": "Abstract"
    }
  ],
  "use_when": [
    "When early interleaving creates confusion before the learner can recognize either pattern on its own."
  ],
  "avoid_when": [
    "Blocking can also create false fluency if it continues too long. Retest with mixed cases once the basic structure is available."
  ],
  "example": "A learner first practises two German sentence patterns separately, then mixes them once each can be produced and the remaining challenge is choosing the right one.",
  "check": "The learner moves from acquisition to discrimination because the observed error changed.",
  "sources": [
    {
      "id": "RS-B82676FFC4E6D020",
      "title": "Similarity matters: A meta-analysis of interleaved learning and its moderators",
      "url": "https://pubmed.ncbi.nlm.nih.gov/31556629/"
    }
  ],
  "relations": [
    {
      "from": "MHC-D-RESEARCH-9012",
      "to": "MHC-D-RESEARCH-9010",
      "type": "use_before",
      "url": "/knowledge/use-near-neighbour-cases-to-train-discrimination"
    }
  ],
  "collections": [
    {
      "id": "RC-EA04F47374E04549",
      "title": "Learn new skills, turn them into career evidence, and protect the main development edge",
      "url": "/collections/learn-new-skills-turn-them-into-career-evidence-and-protect-the-main-development-edge"
    }
  ]
}