The report describes the software of the Industrial Combustion Emissions (ICE) model, developed to support the EPA's analysis of acid deposition control alternatives. The model projects industrial fossil-fuel-fired boiler fuels, air emissions, and costs by state for 1985, 1990, 1995, 2000, 2010, 2020, and 2030. The current base year in the ICE model (Version 3) is 1980. Fuels include natural gas, distillate and residual fuel oil, and coal. Air emissions include sulfur oxides, sulfates, and nitrogen oxides. The report describes the structure of the ICE model (Version 6.0) computer programs, its input and output data files, major internal variables and constants, and the use of comment statements in the model's source code for one of the subroutines. It does not provide the necessary Job Control Language to run the model.