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System Life Cycle (Implementation (2) You run the old and new system in…
System Life Cycle
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Diagrams
Data Flow Diagrams
Most systems deal with information in one way or another. What really matters is how the information flows through the system.
Process Diagrams
People handle information in a specific way - they have a 'process'. For example, an employee makes an expense claim. First of all their manager counter-signs the claim. It then goes to the account manager who authorises payment and so on.
A process diagram will try to show these processes in action.
System diagrams
These show the relationships between the various systems in the company (or even outside if relevant) - how they interact, what depends on what and so on.
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Maintenance
Staff or developers will identify parts of the system which could be tweaked to work more efficiently.
Over time, bugs will be discovered that weren't picked up in the testing. These will need to be fixed.
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Development
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Analysis
The analysis phase is where you look at alternative solutions which could be used to solve the problems.
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Feasibility
During this stage, the company will decide whether there is a need for the system and if the cost of it can be justified
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