| AlternativeCondition | 
 Represents alternative condition in the scenario flow. 
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| ExceptionType | 
 Exception type of flow scenario. 
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| FlowStep | 
 Represents use case scenario flow step. 
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| Scenario | 
 Represents a use case flow scenario. 
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| ScenarioFactory | 
 Knows how to construct scenarios. 
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| ScenarioNode | 
 General node in the scenario. 
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| ScenarioNodeEnd | 
 Represents an end of the scenario node. 
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| ScenarioNodeStart | 
 Represents start of the scenario node. 
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| ScenarioReadResult | 
 Contains success flag and possible errors of scenario read result. 
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| ScenarioRepresentationTextProvider | 
 Contains knowledge how scenario elements should be represented in GUI. 
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