1. Input constraints
Types, ranges, formats, required fields and conditional logic prevent some errors when they occur.
2. Reference lists
Territories, sites, equipment and categories should ideally come from shared reference data rather than free text.
3. Geolocation and evidence
Coordinates, date, photo or signature can strengthen verifiability when collection is justified and governed.
4. Rapid supervision
A daily monitoring view reveals inactive enumerators, outliers, duplicates and uncovered areas.
5. Correction traceability
Post-collection changes should preserve a reason and, where possible, the original value history.