The main goal of the present study, is to provide an in depth exploration of the psychosocial services provided to unaccompanied minors who live in long-term facilities, in order to firstly, generate a model of factors and processes which facilitate or hinder service design, delivery, and evaluation of psychosocial support for unaccompanied minors and secondly, to propose a set of guidelines for: (i) the development and implementation of psychosocial services for unaccompanied minors living in long-term facilities, (ii) the evaluation of these services, and (iii) the support of field workers by their organization.