The model is a set of mathematical equations that define the basic relationships between resources (budgets and/or staff years) and workload (defendants processed) at each stage of the Federal criminal justice system. These equations and the workload estimates they produce are based on the historic relationship between resources and workload for each agency in the model. The model's estimates assume these relationships will not change significantly in the near future. To use the model, one specifies the resources for each agency included separately in the model. The model then estimates the total number of persons (workload) who will move through the investigation, prosecution, and adjudication stages of the criminal justice system during the fiscal year and the number who will enter the correction stage. If an agency's resources remain the same as the previous fiscal year, the model estimates that the workload the agency produces will remain the same. The model also shows whether there is likely to be an increase in pending end-of-year workload at the prosecution and/or adjudication stages. Application of the model to the President's fiscal year 1992 budget request shows that courts would be overloaded. Detailed information on the modeling methodology and applications is appended. 38 tables and 5 figures