A company (a customer) wants to have an information system to support its tender preparation process. The management hires your company to specify and develop or buy a system. You are the requirements engineer responsible for the project. During initial discussions with different representatives of the customer, you find: (1) partly you do not understand the customer's terminology, (2) the representatives do not use a consistent terminology, and (3) the main contact person (at the customer) described his ideas by telling you the expected interactions between specialists and information system in form of different flows of user actions and system reactions. Which of the followings are particularly well suited to elicit and document the requirements in this case?