Improve the credibility of the questionnaire in the design of the questionnaire, the need for the question itself to be logical, easy to understand, to ensure that different people see it will not produce different understandings, resulting in biased results; to improve the validity of the questionnaire must be done to achieve the core of the problem does not miss, dispensable questions do not stay, irrelevant questions do not set up, each question, are going to help the main purpose of the study analysis.
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