Questionnaire and guideline construction: detailed, comprehensible, clear, and practice-oriented. Written surveys, online questionnaires, and face-to-face interviews have one thing in common: the way questions are asked can significantly influence the survey results. To formulate methodologically sound questions, a solid understanding of methods and practical experience is required. This methods manual provides a comprehensive overview of the theory behind questionnaire and guideline construction. With numerous practical examples and exercises, content can be tested and thus practically linked to theory. The realistic examples come from the human and health sciences and offer students and professionals helpful guidance in designing their own surveys. Prof. Dr. Michael Erhart: The author's outstanding expertise is highly valued.