Three-dimensional seismic has had a major impact on the performance of Amoco＇s E&P operations. Tn the last 4 years, 3D seismic has helped improve reserves replacement, improved exploration finding rates and volumes, and had a positive effect on field-reserves revisions. This paper discusses the performance improvements that 3D seismic has brought to the company and suggests ways to measure the impact of emerging technologies. These measures gauge the benefits as well as the easily measured costs when managing technology investments.