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This document has been published within the WESP cooperation project: the Working group Emissions of Service industries and Product use. It is an introduction to the WESP project. WESP publishes process descriptions of processes and activities in the target groups of consumers, construction, service industries, environmental firms and recreation. Targets are to get agreement about the data used by different institutes and to afford support to governmental policy on emission reduction. The documents contain information on the processes, emission sources, emissions to air and water, waste emission factors, use of energy and energy factors, emission reduction, energy conservation, research on clean technology and standards and licences.