How expert are the experts? An exploration of the concept of 'expert' within Delphi panel techniques.

By John R. Baker, K. Lovell, N. Harris. Nurse Researcher, 2006

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Delphi methodology in health research: how to do it?☆ (2015, background): “Equally so, expertise cannot be ensured though number of years in practice [13].”
The Delphi Technique in Nursing and Health Research (2011, background): “Diverse, heterogeneous panels may require larger samples to ensure validity of results (Baker et al., 2006).”
Improving the content validity of the mixed methods appraisal tool: a modified e-Delphi study. (2019, background): “An expert is defined as an individual with knowledge and skills in a specific area [23].”