NFMA changed forest planning by obliging the United States Forest Service to use a systematic and interdisciplinary approach to resource management. It also provided for public involvement in preparing and revising forest plans. Also, NFMA established and expanded several Forest Service trust funds and special accounts. It expanded upon the land and resource management plans (L/RMPs) outlined in the Forest and Rangeland Renewable Resources Planning Act of 1974 (RPA), and started by requiring the Forest Service to do an inventory of all its lands, followed by a zoning process to see what uses land was best suited for - dubbed the "suitability determination." These plans required alternative land management options to be presented, each of which have potential resource outputs (timber, range, mining, recreation) as well as socio-economic effects on local communities. The Forest Service, in cooperation with the Federal Emergency Management Agency (FEMA), contributed considerable resources to the creation of FORPLAN (a linear programming model used to estimate the land management resource outputs) and IMPLAN to estimate the economic effects of these outputs on local communities.