# Test first strategies * Include * TDD * ATDD * BDD ## Differences * Acceptance Test-Driven Development is very similar to Behavioral-Driven Development. However, a key difference between them is: BDD focuses more on the behavior of the feature, whereas ATDD focuses on capturing the accurate requirements. * ATDD is a technique used WITHIN BDD. They are not one and the same. | Parameters | TDD | BDD | ATDD | | ------------- | --------------------------------------------------------------------------------------------- | -------------------------------------------------------------------------- | ------------------------------------------------------------------------------ | | Definition | TDD is a development technique that focuses more on the implementation of a feature | BDD is a development technique that focuses on the system’s behavior | ATDD is a technique similar to BDD focusing more on capturing the requirements | | Participants | Developer | Developers, Customer, QAs | Developers, Customer, QAs | | Language used | Written in a language similar to the one used for feature development (Eg. Java, Python, etc) | Simple English using domain terminology | Simple English using domain terminology | | Main Focus | Unit Tests | Understanding Requirements | Writing Acceptance Tests | | Tools | junit | Gherkin, Dave, Cucumber, JBehave, Spec Flow, BeanSpec, Concordian, yatspec | TestNG, FitNesse, EasyB, Spectacular, Concordian, Thucydides, yatspec | ### Links *