The Inland Empire version of the Prognosis Model, a computer program designed to simulate the development of forest stands, is described. The Inland Empire version is calibrated for eleven tree species occurring on over 30 habitat types. The individual tree is the basic unit of projection and most combinations of species and age classes can be accommodated. Available thinning options allow considerable latitude for simulation of management strategies. Prognosis Model input consists of a stand inventory, including a list of sample trees, and a set of specially formatted instructions that indicate the options selected. The output includes distributions of trees per acre, volume per acre, accretion, and mortality by diameter at breast height and by species and tree value class. In addition, selected sample trees are displayed over time along with parameters that describe general stand characteristics that might influence tree growth. The Prognosis Model can be linked to models that predict pest outbreaks and the impacts of host-pest interactions. It can also be linked to models that predict production of other forest resources. The combined outputs provides a basis for multiresource planning. Preparation of input, interpretation of output, and model formulation are described. Guidelines are given for potential uses and limitations.