Practical guideline on how to use test data

1)    Use all combinations of valid and invalid data when testing
2)    Collect data using positive and negative testing.
3)    Give yourself ample time to test data.
4)    Reevaluate data during each phase.
5)    Involve multiple team members in the collection.
6)    Use test data prior to data execution.
7)    Ensure your data files are uncorrupted.