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Behavior-driven development (BDD) is a collaborative way for business and technical teams to agree on what software should do by discussing concrete examples. Those examples can guide implementation, become automated checks and serve as documentation. BDD is the shared discovery and agreement around behavior—not a particular testing tool or file format.
How behavior-driven development works
BDD begins with a valuable capability or user story. The people who understand the need work with the people building and checking the software to explore specific situations: what conditions apply, what action occurs, and what observable result should follow. The team agrees on the examples before implementation, then uses them to guide development and, where useful, automated checks.
This repeated conversation helps connect business intent with technical work. Behat describes the approach as continuous, example-based communication between business and development roles, organized around context, action and outcome: Behat Quick Start.
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A simple Given–When–Then example
Scenario: A customer signs in with valid credentials
Given the customer has an active account
When they submit the correct username and password
Then they see their account dashboard- Given establishes relevant context or preconditions.
- When names the action or event.
- Then describes an outcome that can be observed and checked.
The example is useful only if the team understands what the terms mean and agrees that the outcome represents the desired behavior. A scenario that merely records implementation details, or whose result cannot be checked, is less helpful as a shared example.
What BDD is—and what it is not
BDD is a practice for building shared understanding through examples. Gherkin is a structured notation commonly used to write those examples. Cucumber is one tool that can execute them. The distinction matters: a team can practice BDD without Cucumber, and running Cucumber does not by itself mean the team is doing BDD. Cucumber’s guidance puts it plainly: “There’s much more to BDD than just using Cucumber.” See Cucumber’s BDD guidance.
In a Gherkin-based setup, a feature file holds human- and machine-readable scenarios; step definitions connect scenario steps to executable checks; and a test harness runs those checks. These are implementation components, not the full collaborative practice. SAP’s Gherkin documentation describes this structure and a workflow in which a team writes a test for new functionality, sees it fail, implements the functionality and makes the test pass.
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How BDD relates to TDD and acceptance testing
BDD developed from ideas in test-driven development (TDD) and acceptance-test-driven planning, and is associated with Dan North’s early formulation. It is not a replacement for all TDD or a wholly separate testing system. Its distinctive emphasis is the business-readable conversation that helps a team identify valuable, verifiable behavior. Automated examples and lower-level tests can then support implementation at different levels.
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1Repair Windows errors before they cause bigger problems2Fix the driver behind crashes, sound loss and screen glitches3Clear out junk files and repair common Windows errorsA useful way to distinguish the work is to ask who needs to understand a check and what question it answers. Shared examples help clarify and agree on behavior; unit tests can explore implementation details, nuances and failure cases efficiently. SAP notes that integration tests can take longer to implement, so not every detailed case belongs in an integration-level scenario.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.When to use BDD examples
Use collaborative examples where a feature’s behavior needs clarification or agreement across business and technical roles. They are especially useful when a team needs to make an expectation explicit before building it, or to preserve an agreed behavior in a form that can be checked.
- Keep scenarios focused on observable behavior and business value.
- Prefer examples that the whole team can read and discuss.
- Use lower-level tests for detailed nuances and failure conditions that would make a high-level scenario slow or unwieldy.
- Choose a notation and automation tool only if they help the team communicate and check the agreed examples.
The core idea is agreement first: examples make the intended behavior concrete, and automation can help keep that agreement visible as the software changes. For more on the practice, see the BDD Wiki.
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