/ The aim of this paper is to analyze the potential of indicators for integrated river basin management and to develop a set of indicators for the management of transboundary river basins. An indicator, comprising a variable or some aggregation of variables, describes a system or process such that it has significance beyond the face value of its components. Integrated river basin management takes into account policies and measures for the multifunctional use of rivers on a catchment scale and associated institutional changes. Indicators are useful instruments for this process for two reasons. Firstly, they meet the information need of policyand decision-makers. Secondly, indicators can be used to structure the definition and description of information needs and collection of information between the different international, institutional, and sectoral management levels. The development of indicators involves a number of steps: definition of aim, construction of conceptual model, selection of variables, comparison with selection criteria, database assessment, and indicator selection. In this paper these steps are discussed and specified for integrated river basin management. This results in a set of indicators describing the pressure to the river, the state of the river ecosystem, the impact to goods and services provided by the river, and the societal response. The proposed set of indicators measured at a river basin scale provides integrated information on the use and supply of goods and services, underlying cause-effect relationships and possible trade-offs and their spatial distribution (e.g., upstream versus downstream). Furthermore, we propose a division of tasks and responsibilities for river basin management with regard to the development of indicators, data collection, and their application in decision-making.Throughout history, human use of goods and service provided by rivers has changed them dramatically. These changes have impacted the river ecosystem, which is expressed by a reduction of species diversity and abundance (Wolff 1978, Admiraal and others 1993, Tittizer and Krebs 1996 and the supply of goods and services, such as drinking water production (RIWA 1997, Ietswaart andVan Dijk 1996), fisheries (Lelek 1989, IKSR 1993, and recreation. The cause-effect relationships underlying these changes are spatially and temporally displaced due to the unidirectional flow from the catchment to the river mouth (Burns 1991, Petts 1994. Policy-makers and water management bodies face the challenge of managing the complex spatial and temporal cause-effect relationships in watersheds and coping with conflicting interests in order to attain a more equitable and sustainable situation than is presently the case. This needs for an all-encompassing approach, and hence concepts such as integrated or comprehensive river basin management have been developed (Downs and Gregory 1991, De Jong and others 1994). River basin management needs practical instruments to implement such concepts in practice and to develop...