Surveys often rely on multiple choice questions. Occasionally, however, respondents are given an opportunity to write in their answers, putting things in their own words, so to speak. That's what the "wörtliche Nennung" is about. IMO, your text addresses the issue of interpreting and analysing these written findings.

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Note added at 2 hrs (2007-09-28 18:16:23 GMT)
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If some of the surveys have been conducted as interviews (and not as written questionnaires), you could go with something along the lines of "descriptive answers/responses"