This is the time for discussion between the partner and the customer. I mean a real deep discussion, almost like a husband and a wife would. The business consultants and the key users will hold a series of meetings in which the key users will explain to the business consultants the way they do business, the information they have to handle through their business processes, the reports they run, the users that are involved in the different stages of each process, the problems they have with their actual business processes, and, most importantly, how they expect the new system to help them solve their daily pains.
The business consultants will need to listen carefully to the key users and understand their pain ...