Resocialization is a process where a prisoner is enabled to reintegrate into society after serving a prison sentence and to become a functional member of the wider social community. Quality cooperation between the prison system, the probation system, the social welfare system and the non-governmental sector is of great importance in order to provide necessary support to this vulnerable group. The aim of this study was to gain insight into the experience of experts on programmes for the resocialization and reintegration of former male and female prisoners into society. For this purpose, 6 professionals participated in this study, 3 probation officers and 3 professionals from three different associations: Let, Roda and Pet plus. For the purpose of data collection, interviews were conducted with experts and answers were obtained to three research questions. The results of the research showed factors for adequate resocialization and reintegration of former prisoners into society, which were: treatment work in penitentiaries and prisons, professional assistance to former prisoners, support from the family and a well-established relationship between experts and users. In addition, the results also presented work specificities of probation officers and experts from associations with a group of former prisoners, and the following specificities are presented: additional training of probation officers, cooperation with different stakeholders in society, individualized approach to the user, use of different forms of work with the user and implementation of work evaluation. With regard to the resocialization and reintegration treatment programs, results were obtained that indicate the advantages and disadvantages of the resocialization and reintegration treatment programs from the position of the professionals. The following were recognized as advantages: a good working environment, greater visibility of the population of former male and female prisoners in society, the existing cooperation of the probation service with various stakeholders in society, adequate portrayal of former male and female prisoners in the media and other positive aspects of treatment programmes. Shortcomings of the treatment programmes of resocialization and reintegration obtained by this research were: the unsustainability of projects and programs, the unrecognized need to implement projects for former prisoners and other negative aspects of treatment programmes. The research pointed to the existing advantages and disadvantages in treatment programmes and projects, it pointed to the increasing need for cooperation and networking of different institutions in society, to the need to conduct more projects for this vulnerable group of users and for these existing projects to be regular and part of constant services that can be provided to former prisoners.