手法を比較

	Deliberative Polling	構造化合意形成手法としてのナショナル・グループ・テクニック（NGT）
分野	Public Policy	質的手法
系統	Process / pipeline	Process / pipeline
提唱年	1991	1971
提唱者	James S. Fishkin	André L. Delbecq and Andrew H. Van de Ven
種類	Deliberative survey method	Qualitative research method
原典	Fishkin, J. S. (1991). Democracy and Deliberation: New Directions for Democratic Reform. New Haven, CT: Yale University Press. ISBN: 9780300051636	Delbecq, A. L., & Van de Ven, A. H. (1971). A group process model for problem identification and program planning. Journal of Applied Behavioral Science, 7(4), 466–492.
別名	Deliberative Poll, Deliberative Opinion Poll, Fishkin Deliberative Polling	NGT, structured group process, nominal group process, priority-setting group method
関連	4	6
概要	Deliberative Polling is a method, devised by James Fishkin, that combines the representativeness of a scientific opinion survey with the informed reflection of deliberation. A large, random and representative sample of citizens is first polled on an issue, then gathered to deliberate over balanced materials and dialogue with experts and one another, and finally polled again. The change between the before and after surveys reveals what the public would think about an issue if it were genuinely informed and had the opportunity to consider it — Fishkin's idea of 'counterfactual' or considered public opinion.	The Nominal Group Technique (NGT) is a structured group facilitation method designed to generate and prioritise ideas, problems, or solutions while ensuring equal participation from all members. Developed by Delbecq and Van de Ven in 1971, it combines silent individual idea generation with structured group discussion and systematic voting to produce a ranked list of priorities. Unlike unstructured focus groups, NGT prevents dominant voices from suppressing quieter participants, making it especially valuable for needs assessment, program planning, and stakeholder priority-setting in applied research and policy contexts.