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implementation (changeover (during changeover (the hardware is installed,…
implementation
changeover
implementation and testing of a new information system a changeover from the old to the new system must take place, this allows the information system to be tested in a real life scenario if necessary
changeover can be approached in may ways depending on the size of the system and the nature of the data being processed
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parallel running
requires the new system to operate for a short period of time alongside the older system. the results can be compared to ensure that the new system is working correctly
advantages
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if any difficulties occur then operations can continue under the old system where there are no errors
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disadvantages
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it is expensive to run two systems eg extra wages , more working hours so more heating and electricity
direct changeover
requires that the new system replaces the old system without any overlap. in some cases direct changeover is the only option eg emergency control system
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disadvantages
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normal operations could be seriously disrupted if the new system has errors or doesn't work as expected
pilot running
requires the new system to operate alongside the old system but only processing part of the data. the results can be compared to check that the system works correctly but pilot running cant test how the system will operate with the larger quantities of data of the real situation
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phased implementation
involves replacing part of a system with a new system while some tasks continue to use the old system. this enables training and installation to be carried out over a period of time
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implementation
the process of constructing the working computer system. it will usually include identifying the...
modules to be used and specifying them
the main data structures within the program
the main algorithms to be used, describing them in pseudo-code or as structure diagrams
producing the program and any other elements of the sytem
installation
is the process of starting to use an information system in a real situation after having designed and developed it. it may enable final testing in a real situation. different approaches are used depending on the size of the system and the properties of the data being processed
user documentation
gives the user any information necessary for the successful running of a piece of software or hardware. this does not generally include many technical details, which will usually be found in technical/maintenance documentation
technical documentation
describes how the system works. it is written for the computer professional rather than the user. the reader will need to have expert knowledge. it will include system documentation, program documentation and maintenance documentation
system documentation
describes the results of the system analysis, what is expected of the system, the overall design decisions, the test plan and test data with the expected results
program documentation
complete description of the software, intended for use when altering or adapting software. it usually includes a statement of the purpose of the software, any restrictions on the use of the software, the format for input data, printed output produced, flowcharts program listings and notes to assist in future modifications
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