I will now discuss the fourth stage: Implementation
In this stage the physical system specifications are converted into a working and reliable solution. It is here that the physical design specifications are turned into code. Integration and testing is the next step, the analyst must run tests which bring all the components together, and this is to ensure that every aspect of the system is working. It is much less costly to catch problems before the system is installed into the business. The users must then test the system to ensure it meets all their requirements; this is called “User acceptance testing”. Once the system is fully tested and the analyst and users are satisfied the system is then fully installed. This phase also involves training users to be able to be able to work with the system. The oversight of the training is the responsibility of the system analyst; it is up to him to ensure everyone is fully trained. The analyst must plan for a smooth changeover from the old system to the new system. This may involve building databases, installing equipment and changing the format of files to the new format. It is essential to know whether or not the users are using the system once it has been installed.
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Reference :Introduction to Systems Analysis and Design
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