Cognitive model - PROJECT B.R.A.I.N.

Concept	Meaning	Current status
Observation/event	Attributed input or processing occurrence	Implemented
Memory/knowledge record	Durable structured interpretation or sourced material	Implemented
Belief	An interpretation with status, authority, confidence, and context	Implemented
Evidence/provenance	Source and processing links that explain a record	Implemented
Candidate	Attributed proposal requiring validation	Implemented, bounded
ACTIVE	Current accepted interpretation	Implemented
SUPERSEDED	Preserved predecessor replaced by a correction	Implemented
Invalidated document	Source excluded from retrieval while retained historically	Implemented
Embedding/index	Model-tagged retrieval representation	Implemented, derived
Autonomous self-improvement	Unattended policy/schema/model modification	Future only

A correction creates a new version and links it to a predecessor. Confidence does not substitute for authority, and document extraction confidence does not equal truth confidence. See canonical state and data lineage.