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people were less willing to answer it. It makes the analysis much more difficult. For example,people were asked their age to see whether age has relation with purchasing weight loss products.Analysis cannot be made if they do not provide age even they said that they bought weight lossproducts before. The respondents were asked to provide their exact age, the refuse rate was muchhigher than simply ask them to give a range. However, if they the respondents provide their exactage, the analysis will become easily.Another trouble is the refusing problem. When people saw the questionnaire, they commonlythought that the questionnaire was too long. Some of them filled half only and left, thequestionnaires were totally useless then. Additionally, people asked what was the topic of thequestionnaires first. When the researcher told them that the topic is “the market of weight lossproducts”, women generally felt embarrassing with the topic and rejected it. The researcher finallycheated the interviewees that the topic was “the market of health products”, then the refuse ratewas decreasing although they found that the topic was not health products finally.The survey will become more perfect if it includes several interviews of weight loss productproducers, but most of them rejected the interview. Some of them said that it was a sensible topic.Some of them did not accept any interview. Therefore, it is rather difficult to understand deeplythe social responsibility and business ethic of the producers. We do not know the real benefits,side effects and ingredients of the weight loss products. A conclusion of their promotional strategyand the contents of their advertisements cannot be made. That are the reason why only some106