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翻了翻讲义:
SDLC system development life cycle 属于structured system analysis
是比较常见的一种方法. 还有一种方法就是object-oriented (O-O).
The SDLC is a model that describes activities and functions that all systems developers perform, regardless of which approach they use. These steps include systems planning, systems analysis, systems design, systems implementation, and systems operation and support. The systems planning phase typically beings with a formal request to the IT department that describes problems or desired changes in an information system or a business process. The IT department then performs a preliminary investigation to identify the scope of the request, which often includes a feasibility study that reviews anticipated costs and benefits of proposed changes. The next step in the SDLC is the systems analysis phase, in which analysts build a logical model of the proposed new system. The purpose of the next phase, called the systems design phase, is to generate a blueprint that will satisfy all documented requirements for the system. This phase involves the design of the user interface and internal and external controls that ensure the system will be reliable, accurate, maintainable, and secure. The result of this phase is a document called the systems design specification that is presented to managements and users for review. The next phase is called the systems implementation phase, in which the new system is constructed. The procedure for constructing a new system is the same whether structured analysis or O-O methodology is used; programs are written, tested, and documented, and the system is installed. Final preparations including converting data to the new system's files, training users, and undergoing the transition to the new system. A formal assessment, called a systems evaluations, is performed to determine whether the system acts as expected. The final stage of the SDLC is the systems operation and support phase, in which the IT staff maintains and enhances the system as necessary.
[ Last edited by clur on 2005-4-21 at 02:55 PM ] |
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