Probation and mediation service is an institution which has been gaining increasingly vital and important position in the field of criminal law. The service focuses on a very wide range of subjects and its activities aim not only to monitor but also to help. It realizes the execution of alternative sentences and also shows activity in pre-trial proceedings and in proceedings before the court decision. It cooperates with many different organizations, it is involved in many projects. For criminal justice it has become an essential and equal partner in dealing with the consequences of crimes committed by both adult offenders and juveniles. It contributes to the favourable development of the re-education of accused and convicted people, supervises proper execution of sentenced alternative punishments and the achievement of their purpose. It makes sure that the collective process was fulfilled to deal with all the adverse consequences of illegal acts of the offenders and that the victims utilize their legal rights and entitlements. Probation and mediation service provides a comprehensive view of both criminal activities and the personalities of offenders.