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Concept
Specification by example
Summary
Specification by example (SBE) is a collaborative approach to defining requirements and business-oriented functional tests for software products based on capturing and illustrating requirements using realistic examples instead of abstract statements. It is applied in the context of agile software development methods, in particular behavior-driven development. This approach is particularly successful for managing requirements and functional tests on large-scale projects of significant domain and organisational complexity.
Specification by example is also known as example-driven development, executable requirements, acceptance test–driven development (ATDD or A-TDD), Agile Acceptance Testing, Test-Driven Requirements (TDR).
Highly abstract or novel new concepts can be difficult to understand without concrete examples. Specification by example is intended to construct an accurate understanding, and significantly reduces feedback loops in software development, leading to less rework, higher product quality, faster turnaround time for software changes and better alignment of activities of various roles involved in software development such as testers, analysts and developers.
A key aspect of specification by example is creating a single source of truth about required changes from all perspectives. When business analysts work on their own documents, software developers maintain their own documentation and testers maintain a separate set of functional tests, software delivery effectiveness is significantly reduced by the need to constantly coordinate and synchronise those different versions of truth. With short iterative cycles, such coordination is often required on weekly or biweekly basis. With Specification by example, different roles participate in creating a single source of truth that captures everyone's understanding. Examples are used to provide clarity and precision, so that the same information can be used both as a specification and a business-oriented functional test.
Official source
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