Questionnaire design is the process of creating a set of questions aimed at gathering information from respondents. It involves determining the purpose of the questionnaire, identifying the target audience, and selecting the types of questions to include, such as multiple-choice, open-ended, or rating scales. Good design ensures that questions are clear, unbiased, and relevant to the research objectives. Effective questionnaire design also considers the order of questions and the overall layout to enhance respondent engagement. Pre-testing the questionnaire can help identify any issues before it is distributed, ensuring that the data collected is reliable and valid for analysis.