The capabilities of 31 existing growth and yield simulators for California, Oregon, Washington, and Alaska were analyzed to determine their relevance in forest management and planning. Most of the simulators are available for the PC environment. Some are available at no charge, but others may require users to purchase a license. Simulators are classified in five groups: individual-tree/distance-independent, individual-tree/distance-dependent, whole stand, disaggregative, and gap. Simulators are briefly described in terms of the range of data, appropriate species, data requirements, and hardware requirements for execution.Retrieval Terms: computer models, simulation.