👉 Questionnaire engineering is the systematic process of designing, developing, and refining questionnaires to ensure they effectively collect the desired information from respondents while minimizing bias and maximizing data quality. It involves understanding the research objectives, identifying relevant questions, crafting clear and unambiguous wording, structuring the questionnaire logically to guide respondents through the data collection process, and testing the questionnaire for reliability and validity. This engineering phase also includes considerations for cultural sensitivity, accessibility, and respondent engagement to ensure the final instrument yields accurate, reliable, and actionable data.