Any fire ignited by management actions under certain pre-determined conditions to meet specific objectives related to hazardous fuels reduction or habitat improvement. A written, approved prescribed fire plan must exist, and NEPA requirements must be met prior to ignition. Prescribed fires are ignited and managed within a "window" (see Prescription below) of very specific conditions including winds, temperatures, humidity, and other factors specified in the burn plan. Prescribed fire is also referred to as a "controlled burn" or "prescribed burn"