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The backbone of any survey study is the instrument used for collecting data. The most common way of obtaining large amounts of data in a relatively short period of time in a cost-effective way is by means of standardized questionnaires. Questionnaire design requires a rigorous process if we want to produce an instrument that yields reliable and valid data and, accordingly, whole volumes have been written on how to construct instruments of good quality (for a review, see Dörnyei, 2010). In the following we discuss what we see as the six key design issues.