From the side of software developers and acoustic experts applying software quality assurance aspects became more and more an essential part of their work and with a standardized framework like the series ISO 17534 we succeeded in keeping the commercial competition out of the common efforts for correct calculations. This correctness is ensured by a set of test cases constructed to disclose any deviation from the algorithms and strategies defined in the official documentation of the method. The strategy how such a test suite can effectively be designed is shown with the calculation method ISO 9613-2 (ISO/TR 17534-3) in comparison with CNOSSOS-EU:2015 (planned ISO/TR 17534-4). The fact that even erroneous regulations in the original documentation can be corrected is shown with the calculation of multiple diffraction in a downward refracting atmosphere.
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