Why do REs write user stories? That is an excellent question. The answer is that in some circumstances the scope of requirement elicitation is greater than the benefit of collecting and writing shall statement requirements, or a process can be captured in ways more accessible to the users who need to validate the requirements.
For example, I have seen cases in which a simple function was used by many users across many groups in an organization. Rather than spending countless hours interviewing different user types from various groups, it proved more effective and efficient to write ...
