Wideband Delphi is an estimation method that uses a group consensus approach to develop project estimates. It derives from the Delphi method developed in the 1950s-1960s. The key steps are to choose an estimation team representing different engineering groups, hold an initial kickoff meeting to brainstorm assumptions and create a work breakdown structure, have individual team members develop initial estimates, then iterate in sessions led by a moderator until consensus is reached on estimates. The method allows participants to explain their reasoning and maintain confidentiality of individual estimates.

1. Wideband Delphi
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2. About Wideband Delphi
• Is an estimation method that helps a group to
estimate the necessary effort and size for a project
• It derives from the Delphi method which was
developed in the 1950-1960s
• While estimating the experience from several team
members is considered
• Used to gain group consensus about what ha to be
done

3. • Choose the team. The project manager selects the
estimation team and a moderator. The team should
consist of 3 to 7 project team members. The team
should include representatives from every engineering
group that will be involved in the development of the
work product being estimated.
• Kickoff meeting. The moderator prepares the team and
leads a discussion to brainstorm assumptions, generate
a WBS and decide on the units of estimation.
• Individual preparation. After the kickoff meeting, each
team member individually generates the initial
estimates for each task in the WBS, documenting any
changes to the WBS and missing assumptions.
Wideband Delphi Procces

4. • Estimation session. The moderator leads the team
through a series of iterative steps to gain consensus on
the estimates. At the start of the iteration, the moderator
charts the estimates on the whiteboard so the estimators
can see the range of estimates. The team resolves issues
and revises estimates without revealing specific
numbers. The cycle repeats until either no estimator
wants to change his or her estimate or the estimators
agree that the range is acceptable.
• Assemble tasks. The project manager works with the
team to collect the estimates from the team members
at the end of the meeting and compiles the final task list,
estimates and assumptions.
• Review results. The project manager reviews the final
task list with the estimation team.
Wideband Delphi Procces

5. Wideband Delphi Advantages
• Participants reveal their reasoning
• It is easier to maintain confidentiality
• Potentially quicker forecasts if experts are readily
available.

6. References
• http://en.wikipedia.org/wiki/Wideband_delphi
• http://www.pmhut.com/agile-estimating-
%E2%80%93-estimation-approaches