The report presents the results of the seminar Integrated Environmental Information Systems in Support of Decision-Making in Countries in Transition held in Moscow on May 29-30, 1995. The aim of the seminar was to facilitate understanding of the role and place of environmental information systems in the process of decision making in transition economies. More specifically, the report provides an assessment of the environmental information management capacities and needs in countries with economies in transition, describes the various international programmes and mechanisms for collection, assessment and harmonisation of data at national and regional levels, and highlights the various recommendations adopted during the seminar.