Minimum methodology
- Predefined research question and sampling approach
- Documented data-collection dates and scripts
- Clear distinction between observation and interpretation
- No undisclosed paid placement in rankings or results
- Aggregate reporting that respects privacy
- Limitations and possible sources of error
- Downloadable methodology or supporting data when appropriate
Corrections and updates
Reports should preserve the original publication date, identify material corrections, and publish new waves as new editions rather than silently replacing unfavorable findings.