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UAT testing – final stage of software development life cycle. When users test the software to see if it can carry out the required tasks it was designed to address in real world situations.

User story – A description of a product feature used for planning and scoping purposes. User stories will be decomposed to a level that can be delivered in a single iteration and can provide value; a quick way to understand the desired functionality of a user experience; a small, concise statement of functionality or quality needed to deliver value to a specific stakeholder.