bdd-principles

Behavior-driven development (BDD) solves the gap between business and technical teams by using shared, executable specifications of system behavior. It replaces ambiguous requirements with concrete examples that both business stakeholders and developers understand, turning those examples into automated tests that serve as living documentation.

Conduct a Three Amigos session by bringing together a business analyst, developer, and tester to collaboratively discuss a feature using concrete examples. Document the agreed-upon scenarios, then turn them into executable specifications that automatically validate the feature as it's built and maintained.

BDD reverses the workflow: examples drive development from the start through the Discovery > Development > Delivery cycle. This produces executable specifications that stay current as behavior evolves, replacing static test cases written after code is complete and prone to becoming stale.

Yes. BDD creates living documentation through executable specifications that automatically reflect actual system behavior. When behavior changes, the tests fail immediately, forcing documentation and code to stay in sync—no manual updates needed.

BDD principles—collaborative discovery, concrete examples, and executable specifications—are framework-agnostic. The core practice is the Three Amigos workflow and example-driven thinking; specific tools implement these principles but aren't prerequisites for learning and applying BDD fundamentals.

In BDD, the concrete examples produced during Three Amigos sessions are written in structured, executable format (scenarios with given-when-then steps). These scenarios are directly translated into automated test code that validates system behavior, eliminating the translation gap between requirements and tests.