Once the new IT system is ready to operate with the new processes set
  and migrated data is in place. It doesn’t mean that you can now start to
  work with the new system.

  Before you start, new system must be validated and compared to the
  legacy system, to make sure that it indeed includes valid information &
  calculations results and works as expected.

  TPM-Validate validation tool, efficiently validate your new system

  It enables to make the required adjustments, and revalidate the system
  in a short schedule in order to resume business activities as soon as
  possible.