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early information system were designed to be operated by information professionals, and they frequently did not attain their stated social purpose. modern information system are increasingly used by persons who have little or on previous hands-on experience with information technology but who possess a much better perception about what this technology should accomplish in their professional and personal environments . a correct understanding of the requirements, preferences, and "information styles" of these end users is crucial to the design and cause of today's information systems.
the principal objective of the systems analysis phase is the specification of what the system is required to do. in the system design phase such specifications are converted to a hierarchy of increasingly detailed charts that define the data required and decompose the processes to be carried out on data to a level at which they can be expressed as instruction of a computer program. the system development phase consist of writing and testing computer software and of developing data input and output forms and convention. systems implementation is the installation of a physical system convention.
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