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Behavioral Driven Development (BDD) in Software Engineering

  • Last Updated : 18 Feb, 2021

Behavioral Driven Development (BDD) refers to an Agile software development process that is derived from the TDD (Test Driven Development) methodology. BDD is considered as a test to illustrate the behavior of the system. It encourages the use of conversation and concrete examples in simple language for everyone involved in the development to bring better clarity on the behavior of the system. In this development, techniques define various ways to develop a feature based on the system’s behavior, and the techniques are combined from Test Driven Development (TDD) and Domain Driven Development (DDD).

Behavioral Driven Development is a good approach in Automated Testing as it is more focused on the behavior of the system rather than the implementation of the code. BDD is facilitated through natural language to express the behavior of the system and the expected outcomes from the system. In BDD all parties are involved like a customer, developer, tester, stakeholder for a collaborated conversation and illustration of the system’s behavior.

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Behavior Driven Development In Agile Development :



  • The client and service provider have a conversation about what they need.
  • The client/customer, developer, and tester elaborate the requirements together.
  • Then requirements are defined in structured scenarios.
  • The helps in the development and act as automated tests,
  • These scenarios are used by the testers as the basis of tests.

BDD Life Cycle :

  1. Describe behavior –
    This includes flow and features of the product means the main vision.
  2. Define requirements –
    Modeled requirements with business rules for a shared understanding.
  3. Run and fail the tests –
    Develop and run the test cases.
  4. Apply code update –
    Refactor it according to the requirement.
  5. Run and pass the tests –
    Run the updated code and pass the test cases.

But the important point is that BDD is not about testing like TDD. BDD is all about achieving business goals and requirements.

Making SDLC more Simple :
SDLC (Software Development Life Cycle) is considered as a framework or specification for any software development. There BDD has a great contribution in making the SDLC process more simple. 

  • Defining requirements/system’s behavior in standard English makes the SRS (Software Requirement Specification) easier and clear.
  • Gives a greater collaboration between Customer, Developer, and Tester.
  • It has a great positive impact on the testing and deployment stage.

Benefits of Behavioral Driven Development :

  • Greater clarity on business goals and customer requirements.
  • Reaches larger customer set as it uses non-technical languages.
  • Helps in defining acceptance criteria before development.
  • Focuses on system’s behavior from client’s and developer’s point of view.
  • Helps in avoiding unnecessary features and includes important features.
  • Reduces effort for post-modification and post-deployment defects.
  • Avoids misinterpretations during the development process.
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