USE CASES / USER STORIES Use cases and user stories are another way to clarify requirements, this time, from the perspective of the user. Use cases are often presented in the form of a diagram showing a user. User stories are typically written in the form "As a , I want to so that . So, for the ATM, we might write "as a bank customer, I want to withdraw cash so that I have money to spend". Confirmations similar to non-functional requirements may accompany these statements (e.g. customer can withdraw up to $5,000 per day in $20 increments). While these are mostly used with Agile projects, they can be helpful in clarifying any relatively complex user interactions. Having this additional form of documentation adds clarity to the requirements, making it easier for the team to determine what designs will satisfy the requirements