What requirements technique is commonly used to describe user requirements?

User stories are a common requirements technique used to describe user requirements because they focus on capturing the end-user's perspective in a simple and comprehensible format. A user story usually follows a specific structure, typically formatted as "As a [type of user], I want [some goal] so that [some reason]." This format emphasizes the needs and motivations of users, enabling teams to understand what the users want to achieve and why it is important.

User stories are effective in agile methodologies where stakeholder engagement and iterative development are key. They help facilitate communication between developers and users, ensuring that the requirements are aligned with user needs and delivering value to the end user.

In contrast, the other techniques listed, such as data flow diagrams, control flow diagrams, and entity relationship diagrams, are more focused on representing system processes, data interactions, or relationships between data entities, rather than directly capturing user requirements. These techniques serve different purposes in the development lifecycle and do not encapsulate the user's perspective in the same way that user stories do.