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    This method is more economical than a face-to-face interview. A telephone interview usually renders feedback proportion at about 70-80%. However, it tends to be applicable for short questionnaires, which are simple and concentrate on a single issue.

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    Relying on a smart questionnaire, you can do an analysis on a sampling representative group for the target market. The bigger the population of the sampling, the more realistic and reliable the finding is. In-person surveys are usually the face-to-face interview at home, at a central location, or a public place,For example, shopping malls, supermarkets or parks.This method allows you to introduce to consumers the new product samples and promptly collect feedback. This type of interview is the most popular in the Vietnam market to have more exact information.

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