The Clean Air Act Amendments (CAAA) of 1990 called for Reasonable Further Progress (RFP) inventories to be submitted to the US Environmental Protection Agency (EPA) for the purpose of demonstrating strategies by which a 15% reduction in volatile organic compound (VOC) emissions will be achieved over the years 1990 to 1996. This requirement applies to moderate, serious, severe, and extreme ozone nonattainment areas. In addition, serious, severe, and extreme areas must demonstrate at least a 3% annual average reduction beginning in 1996 and continuing thereafter until attainment is reached. In order to meet section 182(b)(1) and 182(c)(2) requiremnts, state/local air agencies require a computer system capable of performing 'what if scenario analysis' and reporting the final results (i.e., their Rate of Progress (ROP) inventory) to the EPA (i.e., Aerometric Information Retrieval System (AIRS)). This system will be based upon the 3% RFP Tracking System that was developed in FY92/FY93. The 3% RFP Tracking System to a Multiple Projections System (MPS) will continue to be within the framework of a Windows application. The system will support ROP inventories for ozone and carbon monoxide (CO) and thus will contain VOC, oxides of nitrogen (NOx) and CO data. The most significant change from the original 3% RFP Tracking System to the MPS is the ability to submit a 'final' projection emissions inventory in the format required by the AIRS Facility Subsystem (AFS) and the AIRS Area and Mobile Subsystem (AMS). The MPS is by outward appearance a collection of screens with buttons the user can click. These buttons simplify the task of setting user-defined parameters which the program will use in projecting future emissions and generating screen or hard copy output.