- - it is necessary to guarantee the presence of specialized professionals who can support the escorts (e.g. interpreters, linguistic cultural mediators, psychologists and social workers), especially during pre-departure and flight phases; the use of a checklist with homogeneous and shared parameters at European level is recommended, to allow a better system for collecting and comparing data; it is preferable to monitor flights involving families, minors and other vulnerable subjects, with a view to efficient and reasonable use of the resources of the authorities in charge of monitoring and with the aim of supervising operations in which critical situations may arise and violations may occur; it is essential to stress that returnees must be informed by the authorities of the complaint mechanisms provided for by European legislation and the standards imposed by Frontex and that the complaint forms must be concretely and systematically administered to the interested parties. It is also important to note that a fairly high degree of satisfaction is reported by monitors with reference to the acceptance and implementation of the recommendations made by the competent national authorities. At the same time, the study shows an important and constant commitment of the European monitoring bodies to inform periodically not only their relevant Parliament, but also citizens, civil society and NGOs of the results of their work.