Oddly enough, I had to study this as part of my “management” training. It wasn’t called the Delphi technique, but it was about how as a manager, I should decide what I wanted to do, then bring in the group and use similar techniques to get them to come to the proper conclusion. It also had chapters about how to cut somebody off at the ankles if they didn’t get on board.
You’ve had the ‘controlling group dynamics’, ‘achieving consensus’, and ‘successful group negotiations’ training as well?