A framework for evaluating activities to reduce the demand for drugs in Europe

This paper describes a provisional framework that could be used to help compare and evaluate activities concerned with reducing the demand for illicit drugs in the European Community. It provides a background to European concern in this field, and comments on some methodological problems that arise regarding evaluation. The overall goal of demand reduction may be attempted through a diverse range of activities--treatment and rehabilitation, reduction of secondary harm arising from drug use, primary prevention, and suppression of drug availability and use--each of which may involve different interventions at different levels of generality and with different subsidiary objectives. Thus it is essential that data for evaluation are collected in terms of a framework where demand reduction activities and their objectives are clearly specified, together with criteria for success or failure, appropriate measures for those criteria and suitable methods to obtain those measures. The paper provides some examples of how this framework could be applied to evaluating attempts to reduce demand for drug through treating addicts, and comments on the use of global measures (indicators) of trends in the demand for drugs. A possible administrative structure for comparing drug demand activities in different countries through a European network on health data is suggested.