Every model must have a Base Scenario, which is defined as all the data that is associated with the Spatial Objects in the model. For example, if an Entrance’s parameters reference an Arrival Profile called ‘West Entrance Demand’, then this Arrival Profile automatically becomes part of the Base Scenario.

All scenarios are visible in LEGION Model Builder’s Object Directory, on the tab labelled ‘Scenarios’. See Object Directory for further information.

A scenario can incorporate the following:

• Arrival Profiles
• Delay Profiles
• Exit Profiles
• Event Profiles
• Populated Zones
• Evacuation Zones
• Entity and Supply Types

All additional scenarios are based on pre-existing scenarios (either the Base Scenario or another scenario) with modifications to the original data; for example, ‘Scenario Two’ might be based on the Base Scenario but may use modified demand data or a different Delay Profile, and so on.