18 NPM in Serbia conducts visits to institutions in which the PDLs are placed, according to previously established methodology. Methodology of the NPM in Serbia is above all based on the intention of the Optional Protocol to establish system of regular visits to the institutions. In that sense, the quality of NPM performance is reflected primarily through regularity of visits and the length of the time spent in the institutions in which are the PDLs placed. The plan of NPM in Serbia is to conduct visits to all institutions in which PDLs are placed within the first four years. Apart from previously mentioned, NPM working methodology assumes conducting high quality visits, as well as reports drafting and making recommendations. Preparatory activities are to be carried out prior to the visit, during which the existing data on institution are analyzed, personnel assignments are determined and the working material is delivered to the team members (questionnaires, structure and samples of parts of the reports). NPM teams conducting visits to the institutions where PDLs are placed are multidisciplinary and usually made up of experienced lawyers, psychiatrists, physicians-forensic experts and psychologists. Visits are carried out according to previously established phases. First phase foresees an interview with the management of the institution, and second phase a joint visit of the institution. During the third phase, team is divided into groups for specific areas, most commonly into group for general legal affairs, group for treatment, group for health care, when interviews with heads of relevant organizational units are held and the documentation reviewed. During the fourth phase, interviews with PDLs are conducted, and in the fifth phase, after the short meeting of all groups, the final interview with the management of institution is carried out, in which a preliminary impression concerning the situation in the institution is identified. Acting upon established phases is not mandatory; it depends on the type of visit and other circumstances. NPM Methodology defines the following types of visits: regular visits, follow-up (control) visits, thematic visits and extraordinary (ad hoc) visits. Visits may be announced or unannounced. Questionnaires used and filled-out by the team members during the visits are drawn-up for the purpose of more efficient and systematic work performance. Reports are made according to previously defined format, but they can be structured differently depending on the type of visit and other circumstances. The questionnaires are