First, you have a central question that needs to be answered. The process takes place over multiple rounds. In each round, every participant writes down their initial thoughts and statements regarding the answer. The participants’ statements are collected, copies made, and then re-distributed to everyone, anonymously. Then everyone reads all the thoughts, and comments on the ideas of others and the progress of the group. At any point they can revise their earlier statements, again anonymously. The process repeats for several rounds until a consensus is reached. Even after the process is concluded, all results remain unattributed and anonymous.

this is quite similar to the Franklin methodology in an organizational context

Source: Delphi Method