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Acceptance Test-Driven Development (ATDD) and Behavior-Driven Development (BDD) are both software development methodologies that focus on collaboration between developers, testers, and business stakeholders.

ATDD involves writing acceptance tests before coding to define the expected behavior of the software. These tests are based on user stories and help ensure that the software meets the requirements set by the stakeholders.

On the other hand, BDD focuses on defining the behavior of the software through scenarios written in a specific format called Given-When-Then. These scenarios are used to drive the development process and ensure that the software behaves as expected.

In summary, the main difference between ATDD and BDD lies in the approach to defining and writing tests, with ATDD focusing on acceptance tests and BDD focusing on behavior scenarios. Both methodologies aim to improve communication and collaboration among team members to deliver high-quality software.

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