How does the Delphi method used for forecasting$$ work?

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Part $1$

A$.$

It obtains forecasts through a comparative analysis with a previous situation.

B$.$

It uses measures that are believed to influence the behavior of a variable that the researcher wishes to forecast.

C$.$

It uses a panel of$$ experts, whose identities are typically kept confidential from one$$ another, to respond to a sequence of questionnaires.

D$.$

It uses a single measure that weights multiple indicators and provides a measure of overall expectation.