Startup Ideas Bank
Marble Skill Taxonomy: An ambitious but shaky attempt at revolutionizing primary education curriculum.
AI roast score: 52/100 (D)
The idea
withmarbleapp/os-taxonomy
Marble Skill Taxonomy
An open, structured taxonomy of what children learn across the primary/elementary years — decomposed into fine-grained "micro-topics", wired into a prerequisite graph, and aligned to national curriculum standards. Produced by Marble .
Version: v1 · Topics: 1,590 · Prerequisite edges: 3,221 · Subjects: 8
See it
Every dot is a micro-topic, colored by subject; height is age; each thread is a prerequisite ( full-quality video ). Explore it interactively at withmarble.com/curriculum — tap any concept to trace everything a learner must master before it.
What this is
Most curriculum data is either a flat list of standards or locked inside a product. This dataset is a connected graph of learning :
1,590 micro-topics — a single, teachable idea (e.g. "Building sentences" , "Apparent brightness of stars" ), each with a plain-language description, mastery evidence criteria, a type (conceptual / procedural / representational / language / meta), a subject + domain, and an approximate age range.
3,221 prerequisite dependencies — a directed acyclic graph: "topic X depends on prerequisite Y" , each edge tagged hard / soft and carrying a one-line reason .
Curriculum alignment — each micro-topic links to the standards it was distilled from (NGSS, Common Core, the UK National Curriculum, and more).
Domain clusters — 183 parent-friendly one-paragraph summaries per (subject, domain, age band).
Subjects
Subject
Topics
Science
547
Mathematics
503
English
286
History
90
Personal & Social Development
88
Life Skills
37
Computing
21
Learning to Learn
18
Files
All data lives in data/ as UTF-8 JSON. See schema/ for JSON Schemas and manifest.json for counts + SHA-256 checksums.
File
What it holds
data/topics.json
The micro-topics (graph nodes ).
data/dependencies.json
Prerequisite edges ( topicId depends on prerequisiteId ).
data/curriculum-standards.json
The source curriculum standards, grouped by curriculum.
data/clusters.json
Parent-friendly domain summaries.
data/manifest.json
Counts, per-subject breakdown, per-file checksums.
A topic
{
"id" : " mt_N8CpN1EJrP " ,
"type" : " CONCEPTUAL " ,
"subject" : " English " ,
"domain" : " Grammar & Punctuation " ,
"name" : " Building sentences " ,
"description" : " Understand that words combine to make sentences — a sentence expresses a complete thought… " ,
"ageRangeStart" : 4 ,
"ageRangeEnd" : 6 ,
"centrality" : 0.257 ,
"evidence" : [
" Distinguish between complete sentences and fragments " ,
" Compose a complete sentence with a subject and verb "
],
"assessmentPrompt" : " If {{name}} says something like \" The dog \" , can t
The roast
Your idea of an open, structured taxonomy of what children learn across primary years sounds academically intriguing, but the market viability is highly questionable. With no clear monetization pathway and relying solely on the hope that someone will pay for access (q15=will_pay), this project is hanging by a thread. You're essentially floating a complex data model in a space where simplicity and usability are king. Plus, being a solo founder (q13=solo) with no funding (q14=no_funding) means your execution risk is sky-high.
Moreover, while you tout the data as your moat (q11=data), the actual competitive advantage remains unproven. Your biggest challenge will be convincing anyone to pay for this product when alternatives (like free government resources) are readily available. The educational market is notoriously slow to adopt new technologies, particularly unproven ones. The idea is interesting, but the execution and market adoption are major red flags.
Red flags: No clear monetization strategy (q15=will_pay), high execution risk (q13=solo and q14=no_funding), and market skepticism on adoption (q3=education, q7=subscription, license).
Red flags
- No clear monetization strategy (q15=will_pay)
- High execution risk (q13=solo and q14=no_funding)
- Market skepticism on adoption (q3=education, q7=subscription, license)
Verdict
Interesting idea but lacks a clear path to revenue and faces significant execution risks; rethink your monetization strategy and address market adoption concerns.
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