The Delphi method is an intuitive and qualitative forecasting method. The prediction is worked out as part of a repeated written survey by experts. After each survey round, the estimates of all experts are presented to each participant so that everyone can check and revise their information based on the higher level of information.
In the course of the rounds, on the one hand, the opinions of the respondents converge and, on the other hand, the reasons for remaining deviations are increasingly differentiated. This procedure increases the quality of the forecast from round to round. The prognosis according to the Delphi method is ultimately based on a synergy effect.