23) A Logical model used to gather information about an existing system A) comes only after a physical model of the existing system is created. B) describes how a system actually works, rather than how it should work. C) illustrates how a system functions by describing the flow of documents and computer processes D) illustrates what is being done, regardless of how that flow is actually accomplished. 24) A prototype A) is expensive to create and is therefore only created once user needs are well-defined. B) is making an internal and external review of the system to be analyzed, noting that users may not use the existing AIS as intended. C) is typically created during the physical design phase of systems development. D) can be used to help users identify and communicate their system needs. 25) The task of improving the efficiency of Crawford Insurance's accounting information system was given to a project development team. During the_ step in the systems development life cycle, the team defined the procedures needed to back up and secure the new system's data. A) operations and maintenance B) implementation and conversion C) physical design D) conceptual design