What development approach focuses on delivering expected behavior for testing?

Behavior-driven development (BDD) emphasizes collaboration among developers, testers, and business stakeholders to ensure that the software meets the expected behavior from the users' perspective. In this approach, the development process revolves around defining the behavior of an application in a language that is understandable to all parties involved, often utilizing a shared understanding of how a feature should work.

Through BDD, specific examples of expected behavior are documented in the form of scenarios that are written in a natural language format, making it easier for everyone involved to comprehend the requirements. This focus on behavior helps to bridge the gap between technical and non-technical participants in the development process, enabling better communication about what needs to be tested and ensuring that delivered software aligns with user expectations.

This method fosters a test-first mentality since the scenarios describing the expected behavior inform the development of automated tests. Consequently, as the implementation unfolds, developers can verify that the software exhibits the intended behavior, leading to a higher quality output that meets users’ needs effectively.

The other options offered, while all valid development methodologies, do not specifically center around delivering expected behavior in the same manner. Feature-driven development focuses on building and delivering features in a structured way without the same emphasis on collaborative behavioral requirements. Model-driven development concentrates on creating abstract