Population viability analysis is a generic term for population models that assess the likelihood of species extinction when those species are subjected to a range of management options. t I has been successfully used in the United States to provide input into resource exploitation decisions (Soulé and Gilpin 1986; Thomas et al. 1990) and assist wildlife managers (Shaffer 1983; Lacy et al. 1989; Seal and Lacy 1989). There is enormous potential for using population viability to assist wildlife management in Australia’s forests.