Broadband Delphi is a group consensus technique based on multiple rounds of anonymous estimation. The goal of anonymous estimation is to avoid the “halo effect”, “Bandwagon effect – gathering around common viewpoint”, and the “HIPPO effect – Highest-paid person’s opinion”.
In Broadband Delphi, the participants submit their votes or estimates anonymously. If estimates differ significantly, the facilitator will provide a summary of the estimates, including assumptions, for participants to review their submission.
The facilitator repeats the exercise until the range of estimates become similar and agreeable by most, and the consensus emerge.
Broadband Delphi is a very useful group-thinking technique to maintain group harmony in decision making.