Use Data Validation as a Quality Gate
Design Google Sheets data validation rules that improve completeness, validity, and consistency.
Validation is a quality gate, not a decoration. Use data validation where a wrong entry would create downstream ambiguity. The rule should protect a quality dimension: validity for allowed categories, completeness for required fields, consistency for standard names, or currentness for date windows. Allowed values Use dropdowns for statuses, owners, regions, segments, and review outcomes that should group cleanly. Rule strength Reject invalid input when the field drives formulas. Warn only when humans need flexibility and the exception should remain visible. Reference ownership Keep lists in a reference tab with an owner, so changes to categories are deliberate instead of…
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