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Graphical illustration encompassing worst and best cases of a scenario over time. Whereas the scenario portrays a future situation derived from a combination of data, experience, information and estimates, the scenario funnel expresses the scenario building method along a time scale: The funnel widens with time representing the uncertainty over future situations.
References#Kosow, H. & Gaßner, R.: Methods of Future and Scenario Analysis. Overview, assessment, and selection criteria. Bonn: German Development Institute (DIE) Studies, 2008.