Geographic Information Systems in Petroleum Exploration and Development: An Introductory Essay, by J. M. Yarus and T. C. Coburn. TECHNOLOGICAL FOUNDATIONS. Geographic Information Systems (GIS) Technology: A Brief History, Trends, and Probable Future, by J. K. Berry. An Overview of GIS in the Geosciences, by G. Bonham-Carter. Geoscientific Modeling: Past, Present, and Future, by A. K. Turner. GIS Technology--A Vendor Perspective of its History and Prospects in Petroleum Exploration and Production, by G. Wade. PRACTICAL REALITIES. A Conversation with Petroleum Exploration, by T. C. Coburn, J. M. Yarus, and P. H. Stark. On the Implementation of GIS for Petroleum Exploration and Development: Issues and Perspectives, by T. C. Coburn. CASE STUDIES. Building a Regional Study in GIS, by C. R. Mazzo and W. A. Burroughs. GIS-Based Analysis of Fluid Migration in Sedimentary Basins, by G. Paulus. The Gap Mountain Prospect: A New Approach to Conceptual Geological Modeling, by D. R. Jefferis, M. S. Connelly, and S. Pack. Evaluating International Acquisitions Using a Spatial Database System--A Low-Cost Approach, by A. Haertlein and D. Rich. Use of Geographic Information Systems in Hydrocarbon Resource Assessment and Opportunity Analysis, by K. C. Hood, B. C. South, F. D. Walton, O. D. Baldwin, and W. A.Burroughs. Conducting a Field Study with GIS: Port Hudson Field, The Tuscaloosa Trend, East Baton Rouge Parish, Louisiana, by K. A. Barrell. Waterflood Optimization Using GIS Techniques in Citronelle Field, Mobile County, Alabama, U.S.A., by L. E. Safley and M. L. Fowler. Reservoir Characterization of a Stratigraphically and Structurally Complex Gulf of Suez Oil Field Using Three-Dimensional Modeling and GIS Techniques, by R. A. Day, K. Talaat, and K. S. Hoffman. SUPPORTING ROLES AND APPLICATIONS. Integrated Geo-Systems--A Computational Environment for Integrated Management, Analysis, and Presentation of Petroleum Industry Data, by K. A. Khan. Using the World Wide Web to Manage Exploration and Production Team Data, by C. Fried. GIS--The Exploration and Exploitation Tool, by K. A. Barrell. The USGS GeoExplorer Project: Using New GIS Technology for Scientific Data Publishing, by C. E. Barnwell. GIS RESOURCES. GIS--Public Domain and Inexpensive Software, by B. Gibbs. Bibliographic Resources for GIS in Petroleum Exploration and Development, by P. J. Yarka and T. C. Coburn. LOOKING AHEAD. GIS and Geostatistics--A Marriage of Technologies, by T. C. Coburn and J. M. Yarus. Appendix.