A quick and simple method to assist in determining why inter- tenancy partitions and floor/ceiling assemblies do not achieve performance standards is discussed below. Usually, following on-site measurements to determine compliance, it is often the case that when non-4achievement of the performance standards occurs, the reasons for this needs to be investigated to determine appropriate remedial treatment. The use of Sound Insulation Prediction Software (SIPS), such as INSUL, to predict non4 achievement of performance standards (criteria) is one method of achieving this. This prediction software also supplements other methods which are sometimes time and equipment consuming, e.g. vibration measurements, intensity measurements, and the more destructive methods of demolishing constructions to determine failures.