Auralisation is the audio equivalent of visualisation – the accurate rendering of an acoustic environment such that the listener perceives the result as being natural or real. This work is founded on the development of accurate sound propagation algorithms, and although a number of methods (e.g. beam-tracing, finite difference time domain) are appropriate, none as yet provide a complete solution for the whole audio bandwidth in a reasonable timeframe. This project is involved with developing new methods for calculating and simulating an acoustic field with a view to real-time, walk-through, auralisation. Recent research has explored hybrid modelling solutions and parallel implementation using GPUs, and other approaches may be valid. The application area is also of interest – how can these algorithms be used to predict and determine the properties of our acoustic environments, both inside (such as in the design of concert halls) and out (such as in environmental noise assessment)?