Methodology

How sources and freshness work

A result should make clear whether it comes from pure calculation, a stable reference or changeable official information.

Verification levels

• V0: deterministic mathematics, date, unit or format logic verified by tests.
• V1: stable reference information reviewed periodically.
• V2–V3: prices, services and policies backed by dated official or first-party sources.
• V4: high-impact information requiring current official evidence and careful disclaimers.

Freshness

Changeable records carry a last-verified date and recheck date. Updating a page date without checking the underlying data is not part of our process.