Model

Source Reliability.

Before you read — take it apart

Worked example — fictional property. No real source queried.

Watch before you read

Remove one source. The conclusion changes.

Evidence state

Unresolved

Active sources

KOSMOS validation

Pass
No conclusion may be issued about an unidentified property.
Identity resolved from a tier-A record.
Pass
Every claim must carry the source that produced it.
6 active claims, 6 attributed sources.
Open
Contradictions are preserved, never averaged away.
83 m² (tier A) against 92 m² (tier D). Both retained; no single surface may be asserted.
Pass
A blocking gap must be named before a price is defended.
Conformity statement and filed building notice both present.
Pass
Evidence state may never exceed the strongest active tier.
Ceiling set by the strongest active source.
Pass
A price position requires documented market evidence.
Nine recorded transfers support a price band.

Conclusion

KOSMOS blocked the conclusion.

Rule K3 refuses a single asserted surface while two sources disagree.

Every value above is recomputed from the switches. No video, no recording.

Everything below describes the thing you just made move. Open the KOSMOS bench →

A property claim inherits the reliability of the source it comes from. STRATAFORM makes that inheritance explicit.

ModelPublic reference

The four classes

01
Authoritative
Public registries, notarial deeds, cadastral records, energy performance certificates issued under law.
02
Professional
Surveyor, lawyer, notary and technical records produced under professional responsibility.
03
Structured commercial
Listings on regulated marketplaces or from registered agencies, where the publisher is identifiable.
04
Unstructured
Social posts, private chats, informal notes. Useful signal, low intrinsic reliability.

Corroboration

A claim's confidence rises when independent sources agree, and falls when they disagree. A single unstructured source is treated as a lead, not evidence.

Why it matters

Because a decision made on the wrong reliability class is not a mistake — it's a foreseeable failure. Making the class visible is the first line of defence.

Retrieval transparency

Retrieval

Candidate sources for the fictional property on the KOSMOS bench

Consulted sources · 5 admitted

ACadastral identity
ARegistry surface
BCadastral conformity statement
ABuilding notice on file
CDocumented comparables

Excluded sources

Declared surface — Unattributed

Unreachable sources

Live marketplace listings
Any real cadastral or municipal archive
Notarial deeds and private documents

Completeness

Complete — absence is declared

Retrieved at 2026-01-01T00:00:00.000Z

Constitutional limitations

One fictional property. No real asset is identified, fetched or analysed.
Retrieval is deterministic and local; nothing leaves this page.
Operational retrieval on a real property belongs to STRATAFORM.app.