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
- Def. of problem (1)
- 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
- Prototype
- 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
- Piurpose of test data
- 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
- stages of life cycle
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