Seven Categories Classification
Updated 2026-08-10
INTRODUCTION
English translation pending.
CORE DEFINITION
A bibliographic scheme compiled in the Han dynasty by Liu Xiang and his son Liu Xin, who organized the imperial library into six subject divisions covering the classics, the various philosophers, poetry and rhapsody, military texts, numerology, and technical arts, with a seventh general outline serving as its summary. Its core proposition is that a stable top-level taxonomy makes a large body of knowledge retrievable and transmissible. The qualifier is that the categories must stay mutually exclusive and be revised as new fields appear.
SCAFFOLDING EFFECT
Reduce cognitive load
- Top level naming: decide the six or seven broadest buckets your knowledge domain divides into. - Placement test: check that each item fits exactly one bucket, since overlap destroys retrieval. - Category revision: add or split a bucket when a growing field no longer fits anywhere.
Anchor fast decisions
An unorganized collection can only be searched by scanning, which does not scale past a few hundred items. A fixed set of top-level buckets converts scanning into addressing: each item acquires a location, so a reader reaches it by following the hierarchy rather than reading everything. Retrieval cost falls as the collection grows.
MINIMUM ACTION
In progress 0/1Practice this model in one real situation:
account_treeGenealogyexpand_more
menu_bookReferencesexpand_more
Source support: Explicit
- zh.wikipedia.orghttps://zh.wikipedia.org/wiki/%E4%B8%83%E7%95%A5verified
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