The following types of scenarios are candidates for runtime scenarios:

• The general case (aka the rule) of the most important use cases, features or functions.
• Important interactions with external systems, neighbors or user categories.
• Dynamic behavior of important external interfaces.
• Interactions that affect important quality goals or requirements.
• Error or failure conditions that might influence overall system behavior.
• Bootstrap-, startup or shutdown procedures, especially in distributed systems.
• Interactions that somehow deviate from normal stakeholder expectation, especially deviate from developer expectation.
• Interactions that work in non-standard ways.
• Scenarios or processes that are subject to timing constraints