Evidence policy

Sources, editions and updates

References are part of the calculation contract. They identify where a definition, equation, limit or warning came from.

Source hierarchy

We prefer current primary sources: public standards, government and university extension publications, official technical manuals, and manufacturer documentation for clearly identified products. Secondary explanations are used only when they add context and do not replace an available primary source.

What citations mean

A reference beside a tool supports the claims mapped to it; it does not imply that the publisher reviewed or endorses BrowserPowerTools. Where editions or page locators matter, we show them. A link offered as “further reading” is not silently used as formula authority.

Datasets and licensing

Bundled tables need a documented source, edition, scope and reuse basis. If permission or licensing is uncertain, the table is omitted and the user may be asked to enter a value from a source they are entitled to use.

Review cycle and corrections

Tool pages show a review date and engine version. We re-check high-impact sources when standards or official guidance change. Corrections update both the explanation and the regression fixtures so the published result remains reproducible.