Systems Life Cycle

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Systems Life Cycle

  1. 1. Systems Life Cycle ICT GCSE
  2. 2. Introduction <ul><li>Most businesses need a computerised system </li></ul><ul><li>It could be a system to keep track of students’ names and address </li></ul><ul><li>Or a system to allow customers to access their bank details online </li></ul><ul><li>There are various stages that a business must go through in order to implement a new system </li></ul>
  3. 3. Stages
  4. 4. Analysis <ul><li>The analysis phase is where you indentify the problem and come up with possible solutions </li></ul><ul><ul><li>A good place to start is to examine the existing system </li></ul></ul><ul><ul><li>What improvements need to be made? </li></ul></ul><ul><ul><li>A feasibility report is often produced </li></ul></ul><ul><ul><li>A requirement specification will be produced </li></ul></ul>
  5. 5. Design <ul><li>The system must now be designed to meet the requirement specification </li></ul><ul><ul><li>Data preparation </li></ul></ul><ul><ul><li>Code design </li></ul></ul><ul><ul><li>File design </li></ul></ul><ul><ul><li>Hardware configuration </li></ul></ul><ul><ul><li>Software </li></ul></ul>
  6. 6. Testing <ul><li>You need to check that the system meets all of the requirements set out </li></ul><ul><li>It needs to be thoroughly tested before t is introduced </li></ul><ul><li>The general principle of testing is to check that the system works properly with typical data, data at the limits of what is allowed, and data that is wrong </li></ul>
  7. 7. Implementation <ul><li>Once the system has been testing it needs to be installed for the staff to use, there are three main methods to implement a new system: </li></ul><ul><ul><li>Direct </li></ul></ul><ul><ul><li>Phased </li></ul></ul><ul><ul><li>Parallel running </li></ul></ul>
  8. 8. Documentation <ul><li>Documentation is very important and is split into two distinct types: </li></ul><ul><ul><li>User documentation </li></ul></ul><ul><ul><ul><li>People who use the system every day will need clear instructions on how to use it, but they don’t need to know how it works </li></ul></ul></ul><ul><ul><li>Technical documentation </li></ul></ul><ul><ul><ul><li>People responsible for maintaining the system do need to know how the system works </li></ul></ul></ul>
  9. 9. Evaluation <ul><li>Once the new system is up and running it is important to evaluate it, two key questions are asked at this point: </li></ul><ul><ul><li>Does the finished system meet the specified requirements? </li></ul></ul><ul><ul><li>Does it carry out all required tasks properly? </li></ul></ul>

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