{
  "spec_version": "1.0.0",
  "document_type": "presentation_format",
  "format_id": "format.lesson_plan.v1",
  "display_name": "Lesson Plan Deck (8–20 slides)",
  "intended_use": "classroom_ready_lesson_presentations",
  "updated_at": "2026-02-04T15:25:41Z",
  "audience_fit": {
    "primary": [
      "teachers"
    ],
    "region": "Bulgaria"
  },
  "constraints": {
    "slide_count": {
      "min": 8,
      "max": 20
    },
    "time_min": {
      "min": 20,
      "max": 50
    },
    "text_per_slide_max_chars": 240,
    "visual_density": "medium",
    "activity_ratio_min_pct": 35
  },
  "structure": {
    "segments": [
      {
        "id": "goal_and_success",
        "slides": {
          "min": 1,
          "max": 2
        },
        "purpose": "learning_goal_and_success_criteria"
      },
      {
        "id": "prior_knowledge",
        "slides": {
          "min": 1,
          "max": 1
        },
        "purpose": "activate_prior_knowledge"
      },
      {
        "id": "core_concepts",
        "slides": {
          "min": 2,
          "max": 6
        },
        "purpose": "explain_core_concepts"
      },
      {
        "id": "guided_practice",
        "slides": {
          "min": 2,
          "max": 6
        },
        "purpose": "practice_with_scaffolding"
      },
      {
        "id": "independent_or_group_task",
        "slides": {
          "min": 1,
          "max": 3
        },
        "purpose": "application_task"
      },
      {
        "id": "assessment_exit",
        "slides": {
          "min": 1,
          "max": 2
        },
        "purpose": "exit_ticket_or_assessment"
      },
      {
        "id": "home_extension",
        "slides": {
          "min": 0,
          "max": 1
        },
        "purpose": "optional_home_or_extension"
      }
    ],
    "mandatory_elements": [
      "learning_objectives",
      "activity_instructions",
      "assessment_method"
    ]
  },
  "generation_rules": {
    "tone": "clear_practical",
    "logic": "stepwise_scaffolded",
    "include": [
      "teacher_notes_compact"
    ],
    "avoid": [
      "overloaded_text",
      "pure_lecture"
    ],
    "local_fit": [
      "Bulgaria_school_context"
    ]
  },
  "assertions": [
    {
      "id": "lp1_activity_ratio",
      "type": "hard",
      "rule": "activity_ratio_pct >= 35"
    },
    {
      "id": "lp2_assessment",
      "type": "hard",
      "rule": "must_include_assessment == true"
    }
  ]
}