Freezaillah B.C. Yeom of Malaysia, drawing upon his experience as a forest-resources manager in Southeast Asia, evaluates available information and weighs both positive and negative aspects of the development of lesser-known species within the wider context of resource-management efforts. From the United States, James S. Bethel, with extensive practical forestry experience at both national and international levels, evaluates, from the standpoint of the user, the facts and the conclusions that he and other well-known experts in the field of forest-resource development have drawn from them.