os-taxonomy

Overview

Marble Skill Taxonomy is an open dataset that organizes what children learn during primary and elementary years into small, teachable topics. It addresses the limits of flat standards lists by connecting 1,590 topics through 3,221 prerequisite relationships, with links to curriculum standards and age ranges. Each topic includes a description and evidence of mastery, and the dataset also provides domain summaries. Use the JSON files to explore learning sequences, inspect curriculum alignment, or build tools that represent a learner's progression.

Key features

• 1,590 micro-topics with descriptions, age ranges, subject and domain, and mastery evidence.
• A prerequisite graph with 3,221 hard or soft dependencies, each with a reason.
• Links from topics to source curriculum standards, including NGSS, Common Core, and the UK National Curriculum.
• 183 parent-friendly summaries organized by subject, domain, and age band.

Best for

Useful for educators, curriculum researchers, and developers who need structured primary-level learning data. Choose it to inspect prerequisites and standards alignment or to build tools around learning sequences.