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EARS notation
EARS, short for Easy Approach to Requirements Syntax, is a set of simple sentence templates for writing clear, testable requirements. It guides authors into a handful of consistent patterns, such as 'When [trigger], the [system] shall [response]', which cuts the ambiguity that plagues free-form requirement text.
What it means
Requirements written in ordinary prose tend to drift into vagueness: passive voice, missing conditions, words like 'appropriate' that mean nothing to a tester. EARS fixes this with a small number of templates that force the author to state the condition and the expected behavior explicitly. The structure does the discipline for you, which is why teams adopt it without much training.
There are only a few patterns to learn, covering requirements that always apply, event-driven ones, state-driven ones, optional features, and unwanted behavior. That small vocabulary is the point: consistent, readable requirements that are easy to test and hard to misread. EARS pairs naturally with requirements tools, where the templates can be applied and checked as requirements are authored.
In practice
A vague requirement like 'the system should handle errors properly' becomes, in EARS, 'When a payment fails, the system shall display an error message and log the failure'. The trigger and the expected response are now explicit, and a tester knows exactly what to check.
FAQ
What are the EARS requirement patterns?
Why use EARS notation?
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