Choose the measurement before the table
Write down the population of interest, the outcome, the geographic unit and the observation period. Then choose between an enumeration, sample survey, projection or administrative record. A newer publication date does not necessarily mean more recent observations, and a source designed for one purpose may not support a different question.
Use the topic guides to identify the relevant table family. Detailed official sources may extend beyond the selected profiles and metrics presented on this site; inspect the original file before committing to a local breakdown.
Resolve differences before calculating change
Check whether the territories match across periods and whether historical figures have been recast. Retain the eligible age group, rural or urban classification, status definition and denominator. A labour-force share, a share of all residents and a household share cannot be compared as though they describe the same population.
Read sampling, coverage and revision notes. A small difference in survey estimates may not establish a substantive change, and a break in methods can interrupt a time series. Label observations and projections separately in charts.
Preserve the evidence behind the result
Keep a record of the publisher, table title, original URL, reference period, publication date, location code and any source footnotes. Document unit conversions and list the components of calculated geographic aggregates. Check subtotals when the source provides them.
When publishing a finding, identify what was observed, what was calculated and what remains uncertain. A short explanation of an unresolved boundary or missing table is more informative than a precision the source cannot support.