The first international conference on Advances in Underground Pipeline Engineering was held in 1985. Some 50 authors and over 300 delegates from 20 countries took part in the presentations and discussions on what the state-of-the-art of pipeline technology was at that time. A decade later, the second international conference reviews the progress we have made, if any, on materials, design, corrosion control, coatings, linings, seismic design, hydraulic, special design considerations, trench less methods, and rehabilitation of aging pipelines and manholes, and field performance. Two plenary sessions discussed progress around the globe in many areas and on adequacy of consensus standards. The papers were presented by authors from U.S.A., Canada, U.K., Germany, Sweden, Saudi Arabia, Japan, France, and Australia. They covered such topics as: Special design considerations for pipes made of a variety of materials such as plastic, concrete, and steel; trench less technology for pipeline rehabilitation; and protective coatings and linings. Shifts in types of pipe materials used in different applications over the past decade and projection of future technological needs in this field are given throughout the proceedings.