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What Is a Scenario?

A scenario is a named planning-assumption label — "Base Case," "Upside," "Downside," "New Product Launch" — that overlay blocks reference. Every block inside an overlay carries a scenario, and when the overlay runs, its results are tagged with that scenario's name. This lets you group and compare overlay outcomes by assumption set.

Every workspace has a Default scenario, created automatically. New overlay blocks use it unless you pick a different scenario in the overlay editor.

How scenarios relate to the rest of the model today:

  • Scenarios are referenced from overlay blocks. You choose a block's scenario inside the overlay editor when configuring the block. There is no screen for attaching overlays to a scenario from the scenario's side.
  • The association is recorded when the overlay runs. Until a run happens, the scenario choice lives only in the overlay's configuration.
  • Forecast runs are scenario-independent. Running a Forecast Version produces one baseline; scenarios do not select or multiply what runs. Scenario tags become meaningful on overlay results layered on top of that baseline.

Current limitation: scenarios cannot be attached to Forecast Versions, and there is no bulk "add these overlays to this scenario" management surface. Scenario membership is set per overlay block in the overlay editor; there is no standalone Scenarios page in the navigation.