Section 4(c) of the Wilderness Act of 1964 prohibits ten uses in wilderness. While the law strictly prohibits permanent roads and commercial enterprise, the other eight may be used only if they are necessary to meet minimum requirements to administer the area as wilderness. Wilderness managers prepare a Minimum Requirements Analysis (MRA) to evaluate whether a prohibited use that they propose to use in wilderness is the minimum requirement. Staff at the Arthur Carhart National Wilderness Training Center developed the Minimum Requirements Decision Guide (MRDG) as a tool to help managers prepare this evaluation. Some agencies require the use of the MRDG.