This package contains classes that encapsulate the evidence that a user enters into an ExtendedBN. A Scenario contains a number of Observations. Each Observation is associated with a particular ExtendedNode and contains hard or soft evidence that can be entered into that ExtendedNode. Scenarios can be applied as soon as they are created or they can be saved and reloaded at a later date. A single Scenario can contain Observations that relate to ExtendedNodes from different ExtendedBNs.