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The Noise Model Simulation (NMSim) is a computer model that generates time histories of noise from moving sources accounting for the effects of real terrain on sound propagation. This document is provided on 2 CD-ROM discs, including open sources code, and a User's Manual is included with the installation program files in PDF format. NMSim has existed as a single event aircraft noise model since the mid-1900's and was originally developed in support of noise propagation studies and ran on a PC under MS-DOS. This model has become part of a growing trend toward simulation models for complex situations not adequately addressed by traditional integrated airport noise models and provides both quantitative analysis in terms of spectra and loudness metrics and descriptive display in the format of color renditions and animations of noise. NMSim has been developed into general purpose noise capabilities of earlier versions of NMSim. It also includes ground noise sources and is capable of analyzing multiple-source noise environments.