This book provides an overview of planning and examining the methodology, analytic issues, primary and secondary endpoints and outcomes in headache trials. Throughout the book, guidance on how to design a high quality study and how to evaluate which study has relevant scientific qualification is discussed in detail. Clinical scales and patient related outcome measures (PROMs) to exclude secondary headaches, to diagnose primary headache disorders, to evaluate patients’ health-related quality of life, to detect psychiatric comorbidities, to assess patients’ headache-related disability and...