Group Decision-Making: Delphi vs Expert Classification
The Delphi technique is based on a structured process for collecting and purifying knowledge from a team of experts by means of a series of questionnaires integrated with controlled viewpoint feedback (Janati, 2018). The Delphi process is anonymous and nonhierarchical so it can elicit open and honest views from disparate groups such as clinicians, researchers and, in particular, people with disability and their support network, without group pressure (Karlsson, 2021). The traditional Delphi method consists of five phases: preparation (Phase 1), content development on the relevant topic with an optional so-called round 0 survey (Phase 2), initial content evaluation based on statements in a round 1 survey (Phase 3), re-evaluation of content statements with feedback of all participants in a round 2 survey (Phase 4), and, if necessary, repeats of the pattern of re-evaluation until a consensus is reached (Phase 5) (Waldmüller, 2020). Group Decision-Making Method Based on Expert Classifica
