{
  "schema": "vedokrok.public-item.v1",
  "release_id": "MHC-RPUB-20260920-75ad787a",
  "url": "/knowledge/mix-problems-so-the-method-is-no-longer-announced",
  "id": "MHC-D-RESEARCH-0241",
  "version": "0.1.0",
  "title": "Mix problems so the method is no longer announced",
  "summary": "A page titled 'Use this formula' has already solved part of the problem for you.",
  "kind": "protocol",
  "body": "Once basic methods are understood, mix suitable problem types so each question requires choosing a strategy. A classroom mathematics trial found better delayed performance with interleaved practice. The useful difficulty is selecting the method from the problem itself—not switching randomly between unrelated activities.",
  "limits": [
    "The cited evidence concerns mathematics. Beginners may still need explanation and supported examples before mixed practice."
  ],
  "topics": [
    "union-learning-design"
  ],
  "intents": [],
  "source_ids": [
    "RS-EC12D4CDEB399136"
  ],
  "evidence": [
    {
      "claim": "A mathematics classroom trial found better delayed test performance after interleaved practice requiring students to select the relevant strategy.",
      "source_id": "RS-EC12D4CDEB399136",
      "role": "supports",
      "note": "Evidence from the tested mathematics setting is not a reason to alternate unrelated tasks every few seconds.",
      "locator": "Abstract and Educational Impact statement"
    }
  ],
  "use_when": [
    "You can solve a chapter's exercises but struggle to choose a method on a mixed test."
  ],
  "avoid_when": [
    "The cited evidence concerns mathematics. Beginners may still need explanation and supported examples before mixed practice."
  ],
  "example": "A practice sheet can mix percentage change, proportions and averages rather than giving a labeled block for each.",
  "check": "You choose an appropriate method on a new unlabeled problem, not only execute a named procedure.",
  "steps": [
    "Choose several relevant problem types you have been taught.",
    "Mix them without headings that reveal the required method.",
    "Explain the method choice before calculating and review selection errors separately."
  ],
  "sources": [
    {
      "id": "RS-EC12D4CDEB399136",
      "title": "A Randomized Controlled Trial of Interleaved Mathematics Practice",
      "url": "https://www.researchgate.net/publication/333154174_A_Randomized_Controlled_Trial_of_Interleaved_Mathematics_Practice"
    }
  ],
  "relations": [],
  "collections": [
    {
      "id": "RC-C1E3F750B0A3CC6C",
      "title": "Design practice that survives the study session",
      "url": "/collections/design-practice-that-survives-the-study-session"
    }
  ]
}