Testing is normally done in two stages.
- The first phase of testing is done by the designers and engineers who created the system, usually before the system is delivered to the customer.
The test data that is used in this first phase is similar to data that would be used by the actual customer.
- The second phase of testing is done after the system has been delivered and installed with the customer.
The data used in the second phase is usually ‘live’ data – data that is actually part of the customer’s business / organisation.
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