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The Systems Life Cycle: Development and testing

Does the system work as expected?. The Systems Life Cycle: Development and testing. So far…. You have learnt about the stages involved in Analysis Design So what comes next... Creating the system Testing the system Improving the system. Testing.

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The Systems Life Cycle: Development and testing

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  1. Does the system work as expected? The Systems Life Cycle: Development and testing

  2. So far… • You have learnt about the stages involved in • Analysis • Design • So what comes next... • Creating the system • Testing the system • Improving the system

  3. Testing • Each time that testing shows a problem there will need to be further... • Analysis • Development • Testing • This cycle can happen many times until the system is perfect

  4. Creating data structures and program modules • Once designed by the systems analyst these must be created by the programmer • The programmer will follow the system analysts designs. E.g • Using the recommended programming language • Using the recommended software

  5. Some businesses are able to use existing software to create their desired result • Access and Word for example could be used to mail letters to clients • Other businesses have to have a programme specially written for them this is know as: • Purpose built - OR - Bespoke

  6. Testing strategies • The systems analyst will have created a test plan. • They will also have prepared a set of test data together with a list of expected results

  7. Test data • Usually three types of data are tested • Normal – data which should be acceptable or valid in the system. • Extreme – only used when a range of data is used. Extremes of the range are tested. • Abnormal – Data which is not acceptable or valid in the system. • Lets look back at the data on the previous slide – which is which?

  8. Copy the test plan table and try to come up with some more tests that you’d recommend a school tried on their new system.

  9. Live data • Data which is already used by the business can be used to test the system. • The data output from the new and old systems should match. • If there are differences then there is a problem to be found and solved.

  10. Improvements • After the test plan has been fully tested the systems analyst will have to check the results • Are there any problems which need to be solved? • Sometimes single stepping is used. This is when a system can be run just one step at a time until the problem is found

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