information system: which provides for data collection, storage, and retrieval. The information system also helps transform data into information, and it allows for the management of both data and information. Thus, a complete information system is composed of people, hardware, software, the database(s), application programs, and procedures.
Systems analysis is the process that establishes the need for an information system and its extent.
Systems development The process of creating an information system.
database development describes the process of database design and implementation. The primary objective in database design is to create complete, normalized, non redundant (to the greatest extent pos¬sible), and fully integrated conceptual, logical, and physical database models.
Systems Development Life Cycle (SDLC) traces the history of an information system. Perhaps more important to the system designer.
Planning
The SDLC planning phase yields a general overview of the company and its objectives. An initial assessment of the information flow-and-extent requirements must be made during this discovery portion of the SDLC. Such an assess¬ment should answer some important questions:
• Should the existing system be continued?
• Should the existing system be modified?
• Should the existing system be replaced?
Participants in the SOLC s initial assessment must begin to study and evaluate alternative solutions. If a new system is necessary, the next question is whether it is feasible. The feasibility study must address the following:
• The technical aspects of hardware and software requirements.
• The system cost.
• The operational cost.
Analysis
• What are the requirements of the current system s end users?
• Do those requirements fit into the overall information requirements?
Along with a study of user requirements and the existing systems, the analysis phase also includes the creation of a logical systems design. The logical design must specify the appropriate conceptual data model, inputs, processes, and expected output requirements.
Detailed System Design
In the detailed systems design phase, the designer completes the design of the system s processes. The design includes all the necessary technical specifications for the screens, menus, reports, and other devices that might help make the system a more efficient information generator. The steps are laid out for conversion from the old system to the new system . Training principles and methodologies are also planned and must be submitted for management s approval.
المادة المعروضة اعلاه هي مدخل الى المحاضرة المرفوعة بواسطة استاذ(ة) المادة . وقد تبدو لك غير متكاملة . حيث يضع استاذ المادة في بعض الاحيان فقط الجزء الاول من المحاضرة من اجل الاطلاع على ما ستقوم بتحميله لاحقا . في نظام التعليم الالكتروني نوفر هذه الخدمة لكي نبقيك على اطلاع حول محتوى الملف الذي ستقوم بتحميله .
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