Systems Life cycle (brief)

small mind map of system life cycle bit of the ocr a2 ict. there may be bits missing but its all i could fit it. read textbook or teach-ict.com for more detail :)

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  • Created by: Charlotte
  • Created on: 14-04-13 15:01
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  • Systems Life Cycle
    • stages of life cycle
      • Def. of problem (1)
        • Defining the problem with previous system & that the aim (end result) is not being achieved.
      • Investigation & analysis (2)
        • Full research into current system and possible future system.
      • Design (3)
        • create user requirements & plan the project in detail.
      • Implementation (4)
        • developing the system, code is imputed & has to be correct before validation & verification
      • Testing (5)
        • Validation and verification checks & testing the system
      • Documentation (7)
        • Show the user how to use the system
      • Evaluation & maintenance (8)
        • WWW and EBI. This means the system can be remade at a later date with more idea about how to make it better
      • Installation (6)
        • old system shut down & new one is put into action
    • Different approaches to investigating a system
      • Questionnaires
      • Interviews
      • Meetings
      • Document analysis
      • Observation
    • Software development methodologies
      • Prototype
        • initial design
      • Rapid Approach Development (RAD)
        • producing system within short duration e.g. 6 months
    • Testing
      • Piurpose of test data
        • normal, erroneous & extreme
      • importance of testing and test plans
        • make sure system meets design spec.
        • make sure system returns correct results and actually works
    • Roles & responsibilities
      • Project manager
      • Systems analyst
      • Systems designer
      • Programmer
      • Tester
    • System Specification
      • Defines requirements for new system e.g. facilities and output
    • Requirements Specification
      • Made by systems analyst
    • Design Specification
      • Made by systems designer
      • Piurpose of the system. Notices assumptions, limitations and constaints.
      • Inputs/outputs
    • Project planning tools
      • Critical path analysis (CPA)
      • Gantt chart
    • Modelling tools
      • State Transition Diagram
      • Entity Relationship Diagram
      • Data flow diagram
      • Flowcharts

Comments

Mr A Gibson

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Covers the stages, who does what, ways to do the things that need doing and provides a good checklist for a project or a revision tool for an exam.

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