Using the Delphi Method to Establish Expert Consensus: A Practical Guide
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This Open Access book provides guidance on how to do a Delphi study to establish a consensus across the broad range of disciplines.
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There is no formal sample size calculation for Delphi studies.
“There is no formal sample size calculation for Delphi studies [46, 47].”
From Essential Information About Chronobiology and Chronotherapy for the Optimal Care of People With Bipolar Disorders: An Expert Consensus (2026) · cites this paper as [47]
Section 3, “Determining panel Size” (page not provided), says there is comparatively little guidance on Delphi panel size and offers evidence-based recommendations. It does not explicitly say that no formal sample-size calculation exists, so the categorical claim goes beyond what the copy states. (LLM, conf=0.78)
Experimental — accuracy not yet measuredBefore conducting the study, the authors chose a threshold that required ≥80% of experts to endorse a statement as Essential or Important, on the basis of ≥80% being a commonly employed threshold in mental health research and to be consistent with Delphi studies conducted by three independent ISBD Task Forces.
“Before conducting the study, we chose a threshold that required ≥ 80% of experts to endorse a statement as Essential or Important, on the basis of ≥ 80% being a commonly employed threshold in mental health research [47, 48, 49], and to be consistent with Delphi studies conducted by three independent ISBD Task Forces [50, 51, 52].”
From Essential Information About Chronobiology and Chronotherapy for the Optimal Care of People With Bipolar Disorders: An Expert Consensus (2026) · cites this paper as [47]
There is no gold standard for defining consensus in a Delphi study.
“There is no gold standard for defining consensus in a Delphi study [44, 47].”
From Essential Information About Chronobiology and Chronotherapy for the Optimal Care of People With Bipolar Disorders: An Expert Consensus (2026) · cites this paper as [47]
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Second International Consensus Study of Antipsychotic Dosing (ICSAD-2)
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Democratic forecast: Small groups predict the future better than individuals and crowds.
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Bridging sustainable game management into land use policy: From principles to practice
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Research priorities of members of the British Association for Surgery of the Knee
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Cited by
Sorted by citations
Crouse, J. J., Loblay, V., Jorm, A., Wong, T. R., de Haan, Z., Gorban, C., Shin, M., Tonini, E., Aiken, C., Alloy, L. B., et al. (2026) · Bipolar Disorders · doi:10.1111/bdi.70141 · Cited by 3 · see citing works
“There is no formal sample size calculation for Delphi studies [46, 47].”
Self-citation
- Authors
- Jorm, A.
- Affiliations
- The University of Melbourne (AU)
- Corresponding author
- Jorm, Anthony
- ORCID
- Jorm, Anthony
- Venue
- Advancing Methods for Interdisciplinarity in the Social Sciences
- Publisher
- Springer Nature Singapore
- Published
- 2025
- ISSN
- 3059-3506
- 3059-3514
- OpenAlex
- W4412732349
- Cited by
- 22
- References
- 184
- Citations by year
- 2026: 22
- FWCI
- 40.85
- Type
- book
- Language
- en
- Open access
- hybrid
- doi.org
- Licence
- Locations
- Springer eBooks (publishedVersion, cc-by)
- Funders
- Medical Research Council
- National Health and Medical Research Council (1172889)
- Topics
- Social Sciences › Sociology and Political Science › Delphi Technique in Research
- Social Sciences › Decision Sciences › Management Science and Operations Research › Multi-Criteria Decision Making
- Social Sciences › Decision Sciences › Statistics, Probability and Uncertainty › Reliability and Agreement in Measurement
- Keywords
- Delphi method, expert consensus, consensus building
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