Research & Media

COSA has been developed as a practise based approach, out of a strong belief in ethical and practical principles and was less derived from theoretical insights into sex offender relapse prevention. The call for ‘evidence based practise’, however, is growing in social intervention policies and funding, which means that interventions more and more have to provide proof that money has been well spent and goals are being met.

However, research into the implementation, outcome and possible effects of COSA is still limited. The shortage of research into COSA leaves many research questions still unanswered. Therefoe, more, and more detailed studies into effects and effective processes of COSA are needed to gather evidence of the impact of Circles in different national settings. 

Several partner institution of the Circles4EU project have performed or are performing research within the spectrum of COSA. Here below you find an overview of the research topics. For more information on the  research topic, click on the corresponding link. If you want to add you research to this web page, please complete this form and send it to

Take a look at our previous research page here.


Here you find an overview of articles on COSA published in European media since the start of the project Circles4EU: