The aim of this diploma thesis is to present the activities of the Proba-tion and Mediation Service, especially one of the options for alternative punishment, probation supervision. The first chapter is dedicated to the introduction of the Probation and Mediation Service and probation supervision, its scope and historical development. The second part dis-cusses supervision from the perspective of juveniles. The third chapter presents probation supervision itself for adult offenders, how it works and what it is imposed for. The fourth chapter discusses the scope of probation supervision over offenders and the effect on their further behaviour and prevention of recidivism. In the penultimate part, the most significant recent amendment regarding the abolition of proba-tion supervision is discussed, and in the last chapter, supervision is compared with other countries in the world, especially with our neigh-bours, or with countries where probation itself originated, with regard to its development on individual territories. At the end of the work, the author evaluates individual characteristics, points out problems and presents possible solutions de lege ferenda.