Trust and transparency
Formulas and data sources policy
Our source hierarchy and parameter-versioning process.
Plain-language overviewPolish contextClear and verifiable
Trust and transparency
What you should know
The key information is presented below in a short, scannable format.
01
Key point 1
Legislation, ministries, public authorities and standards documentation take priority. Secondary sources may explain but do not replace a primary source for a regulated parameter.
02
Key point 2
Formulas and parameters are maintained separately. Tool pages show the applicable year and an honest last-review date.
Last reviewed: 3 August 2026.
Useful links
Continue exploring
Read the core pages behind the service or go directly to the tool catalogue.