Methodology
Review process
Each guide serves one reader task. We redo calculations using the stated inputs, units and formulas, disclose rounding and omitted costs, and compare alternatives over matching periods and conditions.
Sources and reference dates
We prefer direct sources such as public authorities, manufacturers and official documentation. Changing rates, prices, rules and specifications include reference dates and sources. We explain what the evidence means instead of merely collecting links.
Limits
Tax, health and contract guides provide general information, not personal diagnoses or guaranteed outcomes. Published specifications are distinguished from our own measurements, and unmeasured performance is labelled as such. Check current official sources and seek qualified advice where personal facts matter.
Translations
Language versions explain the same original guide. Units, example values, source links and important limits are checked against the original; translations are not separate research projects. A guide about Korean rules is not converted into another country’s rules.
After publication
We reopen changed public pages on phones and computers and check text, links, images, tables and calculations. Correct arithmetic still needs an explanation of its meaning and limits.