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Unity, in a scientific perspective At this moment Unity seems a promising intervention to be successful. Yet still no scientific evidence that the intervention is actually effective, the demand for an effectivness study is increasing. In the 12 years that Unity exists lost of attention is given to scientific support and evaluation. An impact study has not yet been executed and the program is still not evidence-based. This report summarizes the most recent scientific support and evaluation for peer methode. On the basis of three levels (see box) this article seeks to determine the scientific status of the Unity model. First, the article starts with a description of the scientific and theoretical basis for this intervention. Then, the results of an evaluation in 2007 are discussed. This study was part of a research study on peer education is conducted by the University of New South Wales. This report is not meant as research report to that study, but rather as an integrated paper provided an overview of the scientific state of Unity. To determine the scientific status of an intervention three levels are defined. Best practice This name is given to a method which in practice has shown that is in practice most effective. These interventions are well described and implemented by various organizations. Important is that the actions and the results are evaluated so that adjustments can be made so that the desired result is achieved. Science based This name is given to interventions based on a scientific theoretical framework. In a science-based intervention an effectivness study has been done, but not according to the rules of a random clinical trial (RCT), so without a controlgroup and not random. The science-based interventions have proved to reduce the symptoms or problems which the intervention is directed to and / or lead to a positive change on intermediate goals. Evidence based An intervention is called evidence based when the effectiveness is demonstrated on the basis of at least one well-run random clinical trial (RCT). An RCT is a study where participants are randomly divided into two or more groups and where one group receives the intervention and the other does not. This latter group served as controls. Only when an intervention has proven its effect after this kind of research, it is assumed that the effectiveness is proven. Summary Unity is a peer education model that focuses on risk reduction of alcohol and drug use in nightlife settings. The theory of planned behavior is a prominent behavioral model that is the theoretical basis of this intervention. Present Unity is a promising method that best practice and science based in the field of alcohol and drug awareness among clubbers. Evaluation among 266 ecstasy users (report to follow) shows that Unity contributes to more information seeking behavior and that the information leads to changes in use in more than half of the respondents. It also showed that visitors of the Unity stand are positive about Unity and that they find the information they get very reliable. The theoretical framework and findings of this study show positive indications of the effectiveness of these interventions. A comprehensive impact study is needed to ensure the effectiveness of Unity definitive evidence.