The Problem Statement should always be written with the least viable product in mind. That's not to say you should be addressing the solution when writing the problem. Before presenting an example, I want to provide a little background into the problem statement so there's no confusion. I'll start with a Use Case: 'The application processes a customer's credit card when given the correct information.' This same Use Case might have been written as a User Story this way: 'A company can pa...