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

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
Development
Testing
Analysis

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. Test student D.O.B in school database
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
Test
Test Data
Expected results
Actual results
Comments
Test student D.O.B in school database
16/04/1992
Accepted
09/09/2007
99/99/9999
Rejected

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. Test student D.O.B in school database
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.
Test
Type of data
Test Data
Expected results
Actual results
Comments
Test student D.O.B in school database
Normal
16/04/1992
Accepted
Extreme
09/09/2007
Abnormal
99/99/9999
Rejected

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