Certain answers may be potentially so important that it is worth attaching a clarification question to them, for example in a 'routed' form:
If you rated the coursebook you are using as "poor" or "very poor," please briefly explain why. Write your answer here:
Clarification questions are also appropriate when there is an "Other" category in a multiple-choice item. Typically, "Please specify" is used and some space is left for the respondent to provide a statement.
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