Delphi methods enable the systematic collection of expert judgments. They have proven to be particularly useful when a certain level of expertise and judgment is required to answer a research question. There are different variants of Delphi methods, such as the group Delphi or the real-time Delphi. The book presents current methodological developments and examples of application in the social and health sciences.The contents● Delphi methods: Concepts and variants - Epistemological discussion - Practical challenges - Delphi in the social and health sciences - Real-time Delphi - Delphi...