Response Validation Ensure you get accurate data and your survey is simple to complete with our extensive response validation options. Make any question mandatory. Specify a minimum or maximum number of replies to multiple choice questions. Add “None of the above”, or “Not applicable” answers to deselect all other choices. Validation is active when scanning or manually keying paper survey replies. Accept only a specific value, or range of values for numeric, date or time response questions. Validate answers to match a predefined or custom format, for example; postcode, email address or your own unique ID format. Find out more about Snaps dynamic questionnaire features: In-survey calculations Two way database links Text substitution (piping) Email alerts Answer Masking Question routing