A particularly unique variation of wideband delphi was shown to me several years ago by Lowell Lindstrom. I’ve had quite a bit of good luck with this approach with various customers and teams. All the tasks are written onto cards, without any estimates showing. The estimation team stands around a table or a wall with the cards spread out randomly. The team members do not talk, they simply start sorting the cards relative to one another. Tasks that take longer are moved to the right. Smaller tasks move to the left. Any team member can move any card at any time, even if it has already been moved
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