It's a sub-genre of the Delphi Technique. https://en.wikipedia.org/wiki/Delphi_method

He has also developed a Future's Research methodology named "Imen-Delphi" (ID). This methodology reflects a new paradigm in Futures' Thinking. The ID aims at structuring a procedure through which a group of experts could invent preferable futures, as opposed to the classical "Delphi" forecasting technique with which a group of experts is engaged in figuring out the most probable future. He is conducting various case studies to enhance its reliability and validity in helping various groups shaping their future imageries. https://en.wikipedia.org/wiki/David_Passig#Imen_Delphi