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When designing a questionnaire, there are five essential steps: define the problem, plan the survey administration, write the questionnaire, conduct a desk check, and pilot the survey. Skipping steps can lead to poor data quality. Using Helen's case for developing a new product called Choconutties as an example, we begin by defining the problem. Key questions to consider include: the purpose of the questionnaire, the target population, the intended use of the information, and potential sources of variation. The purpose statement for Helen focuses on planning the introduction of her new product. Each step is crucial for gathering useful data.
