business information systems
first,it is necessary to gain an understanding of how the current information system (computerized or paper-based) works. Second, a diagrammatic model of the current system workings is produced to ensure that IT professionals and system users are in agreement. finally, a set of requirements for the new information system is produced. the requirements specification will define.
- the features that the new system is required to contain (e.g. the ability for end-users to be able to design their own reports);
- the scope of the system under consideration (for example, is the system intended for just one functional area of the business or is it to embrace all business activities?);
- the intended users of the new system;
- system performance standards, including response times (if required) and reliability needs;
- environment requirements such as physical working environment, operating system and hardware on which the system will run. in this last task, it may be desirable to produce another diagrammatic model, this time of the required information system.