6.1. Goals and Stories

Customers and end users have goals (also known as needs in the UP) and want computer systems to help meet them, ranging from recording sales to estimating the flow of oil from future wells. There are several ways to capture these goals and system requirements; the better ones are simple and familiar because this makes it easier—especially for customers and end users—to contribute to their definition or evaluation. That lowers the risk of missing the mark.

Use cases are a mechanism to help keep it simple and understandable for all stakeholders. Informally, they are stories of using a system to meet goals. Here is an example brief format use case:

Process Sale: A customer arrives at a checkout with items to purchase. The ...

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