This volume details the history of the International Energy Agency during its third decade of existence (from 1994 up to the end of 2003), following on from the previous three volumes which can be viewed as pdf files on the IEA website www.iea.org. Although the IEA's basic institutional arrangements have remained essentially the same over the 30 year period since its establishment in 1974, there have been significant changes in its practice, reflected by developments in budget and work programme issues. The publication also examines its contribution to policy developments, including its focus on the 'three E' policy goals of energy security, environmental protection and economic growth.