Käyttötapauksen

Käyttötapaus, often translated as "use case" in English, is a fundamental concept in software engineering and business analysis. It describes how a user interacts with a system to achieve a specific goal. A use case is essentially a sequence of actions that a system performs in response to a trigger from an external actor, which can be a human user or another system.

The primary purpose of defining use cases is to understand and document the functional requirements of a system from the user's perspective. They help in clarifying what the system should do, for whom, and under what conditions. Each use case typically includes a title, a brief description, a list of actors involved, preconditions, postconditions, and the main success scenario, along with alternative flows and exception conditions.

By detailing these interactions, use cases facilitate communication between stakeholders, developers, and testers. They serve as a basis for designing the system's architecture, developing test cases, and ensuring that the final product meets the intended needs of its users. In essence, use cases provide a clear and structured way to model system behavior and its relationship with the external world.