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BIO503 Past Papers Midterm
The diagram represents a typical traditional file processing environment. Main point the interdependence of program and data, i.e. program and data, is emphasized they depend on each other, they depend on each other too much. As a result of any change in one it affects the other. This is something that makes change very painful or problematic for system designers or developers.
What do we mean by change? and why we need to change the system at all. These things are explained in
Following. Systems (including file processing systems) are created after very detailed analysis requirements of organizations. But it is not possible to develop such a system it does not need to be changed afterwards.
There can be many reasons, mainly that users will get a real taste of the system when it is implemented. That is, users tell analysts or designers their requirements, designers design and later develop a system based to these requirements, but when the system is developed and presented to users, it is only then he realizes the result of the effort. Now it might be slightly and (unfortunately) sometimes very different from what they expected or wanted it to be.
So users ask changes, small or large. Another reason for the change is a change in requirements. For example, previously invoicing was done in the organization on a monthly VU database management system .
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