Take the test plan that you made in the Design phase, and the program that you made in the Implementation phase, and carry out the Testing phase for it.
If you encounter any bugs, record what you observed in the “Actual Result” column of the test plan along with what you plan to do to fix it (or at least where you’ll look to find the bug). Once you’ve changed the code you’ll need to go through another test table to check that your fixes haven’t broken something else in the program.
If when you are investigating the bug you realise that you forgot something in the design that would catch the code then you will need to revisit the Design phase and alter your flowcharts (or pseudocode or structure diagrams). Once the design has been updated then you can update the code to match. Then test again.
Keep repeating this until you can complete a test table and find no bugs in your code.
