Welker, Martin. “Review: Michael Häder &Amp; Sabine Häder (Eds.) (2000). Die Delphi-Technik in Den Sozialwissenschaften. Methodische Forschungen Und Innovative Anwendungen [The Delphi-Technique in the Social Sciences. Research on Methods and Innovative Applications]”. Forum Qualitative Sozialforschung / Forum: Qualitative Social Research 3, no. 1 (January 31, 2002). Accessed February 1, 2023. https://www.qualitative-research.net/index.php/fqs/article/view/901.