Dropdowns will work just fine with a suitably laid out survey form. Simply have a question, then a single dropdown from which an answer can be chosen. Since only one choice is possible, they are mutually exclusive. And, given that it's a survey form, you almost certainly would not want to rely on macros. Office 2008 doesn't support them and, even on other platforms, users might have their systems configured to disable macros or might choose to disable the macros in your form at the prompt.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]