Qualitative extrinsic data are data that are obtained from external sources and are not based on numerical measurements, but rather on opinions, judgments, or perceptions. Qualitative extrinsic data are used with qualitative forecasting techniques, such as the Delphi method. The Delphi method is a technique that involves a panel of experts who provide their opinions on a topic through a series of questionnaires. The results of each questionnaire are summarized and fed back to the panel, allowing them to revise their opinions based on the feedback. The process is repeated until a consensus is reached or the opinions stabilize . The Delphi method is useful for forecasting long-term trends, new product demand, technological changes, or social and economic issues.
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