> ## Documentation Index
> Fetch the complete documentation index at: https://project-brain.rocheaiops.net/llms.txt
> Use this file to discover all available pages before exploring further.

# Cognitive model

> Definitions and implementation status for events, records, evidence, belief state, and derived retrieval.

| 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| SUPERSEDED                  | Preserved predecessor replaced by a correction                    | Implemented          |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](/architecture/canonical-state) and [data lineage](/architecture/data-lineage).