Minimum and Maximum Number of Participants in Delphi Method
H D SHARMA, Professor, India, Member
I don't think there can be any such limit of maximum number. I have conducted Delphi studies reported in Technological Forecasting and Social Change (44,2,1993) in which some 93 participants
helped in consensus.
In fact Mr. Gharaibeh asked for minimum number
and not maximum. Theoretically there is no lower bound on the number but the number should be large enough so as to reach a realistic consensus
It should be kept in mind that Delphi is a consensus methodology
and the arrived consensus should not seem to be contrived. Inter round drop off
of around 10 to 15 % is to be expected in most cases.