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Delphi with feedback of rationales: How large can a Delphi group be such that participants are not overloaded, de-motivated, or disengaged?

Belton, Ian; Wright, George; Sissons, Aileen; Bolger, Fergus; Crawford, Megan M; Hamlin, Iain; Taylor Browne L?ka, Courtney; Vasilichi, Alexandrina


Ian Belton

George Wright

Aileen Sissons

Fergus Bolger

Iain Hamlin

Courtney Taylor Browne L?ka

Alexandrina Vasilichi


In this paper, we investigate the effect of Delphi group size and opinion diversity on group members’ information load as well as on their overall experience of the Delphi process - in terms of task involvement (enjoyment and interest) and in terms of group sway (the influence and helpfulness of others’ rationales). For Delphi applications involving the exchange of rationales between participants, we found no evidence that group sizes of up to 19 participants cause information overload or de-motivation and disengagement of participants.

Journal Article Type Article
Acceptance Date May 17, 2021
Online Publication Date Jun 4, 2021
Publication Date 2021-09
Deposit Date May 19, 2021
Publicly Available Date Jun 5, 2023
Journal Technological Forecasting and Social Change
Print ISSN 0040-1625
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 170
Article Number 120897
Keywords Delphi; group processes; information load; Information overload
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