INFORMATION SYSTEM IMPLEMENTATION AND MAINTENANCE

Information Systems Life Cycle can be divided into three broad categories. 

A.   SYSTEMS ANALYSIS

B.   SYSTEMS DESIGN

C.   IMPLEMENTATION AND MAINTENANCE

IMPLEMENTATION AND MAINTENANCE

The remaining steps in the systems development process translate the solution specifications established during systems analysis and design into a fully operational information system. These concluding steps consist of programming, testing, conversion, and production and maintenance. 

1. Programming

The process of translating design specifications into software for the computer constitutes a smaller portion of the systems development cycle than design and perhaps the testing activities. But it here, in providing the actual instructions for the machine, that the heart of the system takes shape. During the programming stage, system specifications that were prepared during the design stage are translated into program code. On the basis of detailed design documents for files, transaction and report layouts, and other design details, specifications for each program in the system are prepared. 

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Some systems development projects assign programming tasks to specialists whose work consists exclusively of coding programs. Other projects prefer programmer/ analysts who both design and program functions. Since large systems entail many programs with thousands – even hundreds of thousands – of lines of code, programming teams are frequently used. Moreover, even if an entire system can be programmed by a single individual, the quality of the software will be higher if it is subject to group review. 

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SYSTEMS LIFE CYCLE

The Systems Life Cycle is the oldest method for building information systems and is still used today for complex medium or large systems projects. This methodology assumes that an information system has a life cycle similar to that of any living organism, with a beginning, middle, and an end. The life cycle for information system has six stages: project definition, systems study, design, programming, installation, and post-implementation. Each stage consists of basic activities that must be performed before the next stage can begin. 

The life cycle methodology is a very formal approach to building systems. It partitions the systems development process into distinct stages and develops an information system sequentially, stage by stage. The life cycle methodology also has a very formal division of labor between end users and information systems specialists. Technical specialists such as systems analysts and programmers are responsible for much of the systems analysis, design, and implementation work; end users are limited to providing information requirements and reviewing the work of the technical staff. Formal sign-offs or agreements between and users and technical specialists are required as each stage is completed.  

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Product or output of each stage of the life cycle that is the basis for such sign-offs. The project definition stage results in a proposal for the development of a new system. The systems study stage provides a detailed systems proposal report outlining alternative solutions and establishing the feasibility of proposed solutions. The design stage results in a report on the design specifications for the system solution that is selected. The programming stage results in actual software code for the system. The installation stage outputs the results of tests to assess the performance of the system. The post-implementation stage concludes with a post-implementation audit to measure the extent to which the new system has met its original objectives. We now describe the stages of the life cycle in detail. 

STAGES OF THE SYSTEMS LIFE CYCLE

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