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Build a Three-Whys Customer Insight Ladder

I get a structured insight ladder: a starting customer statement, an ordered chain of at least three deepening whys, and a final layer that separately names the functional and emotional need, so I know what really, really drives my customer.

You receive: A JSON object {startingWant, ladder:[{level, why, answer}], functionalNeed, emotionalNeed, socialNeed} with the ladder ordered by ascending level.

Part of Pitch Investors

What's verified: STUD verifies the ladder has a starting want, at least N contiguous ascending why-levels each phrased as a why-question with an answer, and distinct functional/emotional (and optionally social) needs. STUD does NOT judge whether the whys are the RIGHT questions, whether the answers are true to a real customer, or whether the discovered motivation is the actual root cause.

{
 "buyerParamKeys": [
  "requireSocialNeed",
  "startingWant"
 ],
 "checkNames": [
  "format_parses",
  "starting_matches",
  "ladder_length",
  "levels_ordered",
  "why_form",
  "answers_nonempty",
  "functional_emotional",
  "social_need_present",
  "distinct_needs"
 ],
 "constants": {},
 "deliverableLabel": "three_whys_insight_ladder",
 "documentKeys": [
  "answer",
  "emotionalNeed",
  "functionalNeed",
  "ladder",
  "level",
  "socialNeed",
  "startingWant",
  "why"
 ],
 "enumLiterals": [],
 "submission": "a JSON document (submitted as a string), validated as data; every check below must pass",
 "tier": "doc-validator"
}