System life cycle

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why might new ict systems be commisioned
1) the current one is out of date and is no longer doing its job 2) a competitor developed a new system so the organisation will need similar services to offer 3) technology moved on and new things are available
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what are the 9 stages of the system life cycle
1) definition 2) investigation and analysis 3) design 4) implementation 5) testing 6) instilation 7) documentation 8) evaluation 9) maintanance
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Investigation and analysis dosumentation
1) system diagrams - shows the relationship between various systems 2) data flow diagram - shows how the movement of information flows through the system
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name 3 stages within the design stage
1) project planning - gant chart 2) requirements spec - data inputs to the system, data outputs from the system, data processing within the system 3) data dictionaty , - tables, fields, records, -validation, - Query structures
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3 contraints within a feasibility study
1) cost - how much will the new system cost to develop 2) time - how long will it take to make the new system 3) training - what training will be needed one the system has been developed
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3 stages of the user requirements
1) an introduction 2) context 3) specific details required
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what is the role f the user requirements?
1) eliminate misunderstanding 2) reduce errors 3) gain user agreement
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define: the implementation stage
1) the software development stage
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name 3 things that are developed during the inplementation stage
1) the tables and data structures 2) validation 3) Queries
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what document can be used to test a system?
1) test plan
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2 advantages of direct changeover
1) new system available to everybody 2) cheapest method
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2 disadvantages of direct changeover
1) riskiest method of something goes wrong 2) all the data from the old system has to be transferred to the new system
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2 advantages of parallel changeover
1) less risky than direct method, if system fails the old system will be more up to date 2) less stress for staff as the will have the security of the old system
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2 disadvantages of parallel changeover
1) time consuming as data is entered on both systems 2) extra cost of running and maintaning 2 systems
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2 advantages of phased changeover
1) less risk of system going wrong if it does it only affects one part 2) staff are introduced to changes in small stages
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2 disadvantages of phased changeover
1) this method can take a long time 2) difficult to integrate the old system and the new system
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2 advantages of pilot changeover
1) any problems are identified without affecting the whole company 2) only a small part of the business is affected, the rest of the business continues using the old system
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3 typical things paper based documentation includes
1) table of contents 2) glossary of key terms 3) index
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how can onscreen documentation take a form of
1) wepages 2) PDF file format
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technical details to help with maintanance includes:
1) test results 2) security details 3) how to back up the system
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who does evaluation involve
1) client 2) designer 3) tester
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define: corrective maintenance
1) problems are identified with the system after instalation, and the developers fix the problem
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define: adaptive maintenance
1) external influences that can change the system e.g vat rates change from 20% to 10%, so alterations to the system have to be made
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define: perfective maintenance
1) the system has been running and the end user finds tweaks on how to improve the system, so the maintenance team adapt the system
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what are the 9 stages of the system life cycle

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1) definition 2) investigation and analysis 3) design 4) implementation 5) testing 6) instilation 7) documentation 8) evaluation 9) maintanance

Card 3

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Investigation and analysis dosumentation

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Card 4

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name 3 stages within the design stage

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Card 5

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3 contraints within a feasibility study

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