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Screener is one of the most important part of the questionnaire - most of the time at the very beginning of a survey - which helps to identify if the respondent fits the targeted audience. If the participants fit the target audience, then he will be able to continue the survey. For data quality purpose, a good screener needs to be concise , blended and by all means not leading. (to build screening questions in a smart way so the respondent can not guess what the study will be about).
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