Questionnaires can reveal surprising data about a given group of people. Most people take solace in knowing that their opinions become anonymous (at least, that's how most questionnaires work). One advantage of a questionnaire, therefore, is that people are typically brutally honest. This is because questionnaires are usually procured for an event or routine that is in need of change, so people that are somehow linked to said event or routine are only too happy to comment on it. Questionnaires can also harbor a wide variety of questions in a relatively short space, allowing for an efficient gleaning of information from a given group of individuals.
Another advantage of questionnaires is that they are a relatively quick method of data-gathering. Most questionnaires are short, simple and to the point, and can be done quickly, allowing for the accelerated gathering of a lot of information in a short time. Because of their shortness and simplicity, questionnaires are a perfectly valid and, should efficiency be called for, excellent method of information gathering, perfect for someone who needs to gather a lot of information in relatively short order, quickly dissect it, and disseminate its contents into a research endeavor.
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