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The Federal Aviation Administration, Office of Environment and Energy, Noise Division (AEE-100) has developed Version Version, 6.0 of the integrated Noise Model (INM) with support from the ATAC Corporation and the Department of Transportation Volpe National Transportation Center. New features in INM 6.0 include: four new aircraft; modified engine and aerodynamic coefficients for ten aircraft; approach and departure average noise spectra for all aircraft; C-weighted noise metrics for low frequency noise analysis; NPD curves using SAE-APR-866A atmospheric absorption; a new function to compute pounds thrust using EPR or N1 values; a revised acceleration algorithm for computing procedural profiles; a jet thrust equation for high temperature/altitude cases; a subdivided first climb segment for more accurate exposure calculation; a revised noise exposure fraction algorithm for more accurate exposure calculation; a revised noise exposure fraction algorithm for more processing; flight segment significance testing for faster run time; 32-bit NMPlot contour generation; and support for long directory names. INM Version 6.0 software runs on PCs using a minimum hardware configuration of a Pentium II processor, Microsoft Windows 95, 98, or NT 4.0 operating systems, 64-Mb RAM, mouse input device, hard disk drive, and CD-ROM drive.