Abstract
Since the break-up of AT&T in 1984, the telecommunications sector has been in a process of quick and very important changes. In this paper the evolution of the performances in the telecommunications sector are analysed by combining two approaches: the DEA (Data Envelopment Analysis) method and the use of financial indicators. Various DEA analysis, among which some ≪ window analysis ≫, are applied and throw light and shade on different facets of the performances of the operators at the international level. Then a brief financial analysis gives some indications about the financial positioning and dynamics of the operators. The first main conclusion concerns the use of the network: the European operators, especially the French operator, offer a limited access to the network with high prices. The evolving situations of the operators are the second issue: in the United States, in a competitive context the differences between operators have increased and some restructurations have occurred; in Europe, the less deregulated operators, Deutsche Telecom and France Telecom, are behind British Telecom and Telecom Italia.
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