Open questions allow the respondent to answer whatever they want (for example, "What do you like best about accounting software?"). Open questions are invaluable when the interrogator is trawling for ideas (for example, "Which features do you most frequently use?"). They are less successful when you want to find out which new features end users would like. Respondents are often at a loss to come up with sensible suggestions (even by their own standards). This is understandable, as people are asked about matters to which they have given little or no previous thought.
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