This proceedings of the session sponsored by the Technical Council on Lifeline Earthquake Engineering in conjunction with the ASCE National Convention in San Diego, California, October, 1995 describes earthquake performance of electric power, communication, gas, liquid fuel, water, wastewater, ports, air transportation, highway, and railroad systems. The earthquake damage of the systems is reviewed, major vulnerabilities are identified, and mitigation methods are described. The most important issues effecting earthquake performance are discussed and research needs are identified. A common shortcoming noted for most lifelines was the lack of earthquake performance standards, which make it difficult to rationally establish equipment and facility seismic specifications.