Which approach involves defining acceptance tests in the stakeholders' domain language?

The approach that involves defining acceptance tests in the stakeholders' domain language is known as acceptance test-driven development (ATDD). ATDD emphasizes collaboration between developers, testers, and business stakeholders to ensure that everyone has a shared understanding of the requirements and acceptance criteria for the software being developed.

In ATDD, acceptance tests are written in a way that uses terminology and language familiar to the stakeholders, which helps bridge the gap between technical and non-technical members of the project team. This focus on the domain language enhances clarity, reduces misunderstandings, and ensures that the delivered software meets the actual needs and expectations of users.

Behavior-driven development (BDD) also emphasizes collaboration and may utilize domain language for defining behaviors; however, BDD typically focuses on specifying behaviors for individual features and often uses examples and scenarios rather than formal acceptance tests. While test-driven development (TDD) and agile programming have their own methodologies, they do not specifically focus on stakeholder collaboration for defining tests in the domain's language. TDD centers around writing unit tests before code, and agile programming encompasses a broader range of practices without the same direct focus on acceptance tests.