The authors describe the conservation plan they prepared at WWF's request while they were engaged on a two-year study of the Indonesian island of Siberut in 1976–78. Their plan is designed to conserve as much as possible of both the remarkable wildlife, which includes many endemic species, and the people's traditional way of life. Edited and coordinated by Jeff McNeely, whose article describing Siberut is on page 159, this plan is now being considered by the Indonesian Government.