Test case creation tips 

• Only create test modules for transactions which you know well.
• Only call transactions by reference to a test module.
• Only put one transaction in a test module.
• Always use parameters to pass values to transactions.
• Choose the parameters and screen sequence so as to make the test case as generally usable as possible.
• Avoid creating new test cases when existing ones can be modified.
• Always modify test cases so that they remain compatible.
• Document all test cases.
• Use existing test cases in other applications to use their transactions, requesting modifications if necessary.
• Use variants to broaden the range of tests.