ICT A2 CHAPTER 1 A

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michaelarayner
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System Life Cycle

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Give all 9 stages of the system life cycle in order Definition, Investigation & Analysis, Design, Implementation, Testing, Installation, Documentation, Evaluation, Maintenance
What is the definition stage for? Identifying the problem, what the system does and how it should work -- feasibility study
What is done in the investigation and analysis stage? The system is investigated to provide details of the problem, current methods used. A requirements specification is produced.
What is done in the design stage? Design specification is made. Follows req. spec. (Test plan, data capture, input and output methods, data dictionary, project plan, processes)
What is done in the implementation stage? The system is created, prototyping & feedback
What is done in the testing stage? Follows the test plan, finds errors, corrected and retested (iterative process)
What is done in the installation stage? The changeover (parallel, pilot, phased or direct)
What is done in the documentation stage? User doc (how to use) On screen doc (tips/help/error mssgs) Technical doc (maintenance - code/backup/data dict.)
What is done in the evaluation stage? Compare new system to old system, compare timescales etc. Identify maintenance.
What is done in the maintenance stage? Changes are made. Perfective (improvements wanted) Adaptive (new circumstances) Corrective (errors)
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