A group method used in evaluation to reach consensus for future action. It is a predictive technique and ascertains the views of a number of experts on a question or questions over several rounds. Answers to the first round are analyzed and categorized, and then a second round of questioning takes place. There can be any number of rounds, but two or three are usually enough.
Mathison, S. (2005). Encyclopedia of Evaluation. Thousand Oaks, CA: Sage.