39. Which way to collect primary data is one page, with questions that are clear, easy,and specific? 40. Which way to collect primary data is an interview with groups of target customers who provide valuable opinions?

39. **Questionnaire/Survey:** A well-designed questionnaire, often kept to a single page for brevity and ease of completion, uses clear, easy-to-understand, and specific questions to gather data directly from respondents.<br /><br />40. **Focus Group:** This method involves gathering a small group of target customers and engaging them in a guided discussion to obtain their opinions and insights on a particular product, service, or topic.<br />