Consistent success in prescribed underburning requires managers to specify acceptable levels of fire injury and to describe the fuels, weather, and fire behavior necessary to accomplish the objectives. Information is assembled to assist managers in this process. Relationships between fire behavior, tree morphology, and fire injury are discussed. Implications of fire injury on the survival and growth of trees are presented. Guidelines are presented for establishing acceptable levels of crown, bole, and root injury and for limiting injury to acceptable levels. Source: Canadian Forest Service, Northern Forestry Centre. Abstract reproduced with permission of the Minister of Public Works and Government Services Canada, 1999.