MSR37 Methodological Review on Delphi Technique: Expert Definition and Retention in Rare Diseases

The Delphi method is widely used for reaching consensus in . However, there are no standard criteria for the definition of panel members, what constitutes a sufficient number of participants to ensure stability of results, or how to maintain a high response rate and interest, particularly in rare diseases. We reviewed scientific literature and outline personal experience to provide insight into good practices for defining and selecting experts on rare diseases, and to increase the response rate at first and subsequent Delphi rounds.