xiii Acknowledgments The authors have benefited from numerous discussions with and materials provided by representatives of international government agencies, industry, academia, and non-governmental organizations. The authors thank these many different people from around the world, including: Minoru Akiyama, Jacob Gyamfi-Aidoo, Santiago Borrero, Leandro V. Buendia, S. Chacowry, Denis Chagnon, Michael Coughlan, Michael Crowe, Roland Fuchs, Peter Holland, Dora Ines Rey, Sachiko Ishizaka, Glenn Johnstone, John Kelmelis, Karen Kline, Yang Kai, Jean-Philippe Lagrange, Robert Landis, Neil Leary, Karen Levoleger, Ian Masser, John Moeller, Evans Mukolwe, Hiroshi Murakami, Alan Stevens, Alan Thomas, Hassan Virji, Wendy White, and Martin Yerg. We also thank Kate Lance and Bruce McKenzie for their detailed reviews of the document, and David Adamson for his editorial help. A special thanks goes to the FGDC for its funding of this study, and the Geographical Survey Institute of Japan for contributing financial support to this study. Any errors of fact and judgment are those of the authors. Views and suggestions expressed here are not necessarily those of RAND, the GSDI Secretariat, the Geographical Survey Institute of Japan, FGDC, or any of RAND's sponsors.