A new, trajectory-type, air quality simulation model called Ozone Isopleth Plotting Package (Research Version) (OZIPR) has been developed. OZIPR is based on previous versions of EPA's Ozone Isopleth Plotting Program (OZIPP) Model, but contains improved and expanded capabilities that make the model useful for research purposes. OZIPR serves the dual purpose of providing: (1) a simple trajectory model capable of using complex chemical mechanisms, emissions, and various meteorological parameters, and (2) procedures through which the Empirical Kinetics Modeling Approach (EKMA) can be implemented to calculate emission reductions for compliance with the National Ambient Air Quality Standard for ozone. While these capabilities were included in earlier versions of OZIPP, the new OZIPR contains major improvements that expand the program's capability to input, utilize, and output a much larger range of information. The Project Report serves as a user's manual for OZIPR. It contains a description of the model, along with input and output requirements and options. The input and output files for nine examples are also included.