“…Recently, Dance and Shield 20 have suggested that it is possible to more accurately predict the sound propagation in an empty factory using sound pressure to predict the sound pressure levels in a room rather than to model only the energy in the room. Hodgson et al 21 recently wrote a model which can calculate the precise phase change on reflection from a room surface to help improve the accuracy of prediction. These refinements to various mathematical models may provide predictions with a high degree of consistency and reliability.…”