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.

Research into the implementation, outcome and possible effects of COSA is still limited. CirclesEurope aims to support the dissimination of research findings and wants to support (international) research into COSA.