A description that outlines how a proposed system operates and interacts with users within defined circumstances is known as what type of scenario?

The correct answer is that a description outlining how a proposed system operates and interacts with users within defined circumstances is known as an operational scenario. This type of scenario focuses specifically on the use of the system in real-world situations, illustrating user interactions, workflows, and processes within a defined context.

Operational scenarios are crucial for understanding how the system will function in practice, providing insights into user needs and potential challenges. They often detail the various conditions under which users will engage with the system, helping to ensure that the design and functionality align with actual use cases.

In contrast, functional scenarios are primarily concerned with specific functionalities or features of the system rather than overall interactions and contextual usage. Performance scenarios would focus on metrics like speed and capacity under certain conditions, while non-functional scenarios deal with quality attributes such as security and usability, rather than direct user interactions.