Positive psychology has fully examined the flourishing among healthy people but neglected to understand how "optimal human functioning" can apply to the life experiences of a vulnerable person. Considering methodological issues, this article gives a brief overview on how the conceptualization of mental health and mental disorders affects the consideration of strengths along with the presence of dysfunction with the emergence of positive psychology. First, we summarize the shortcomings of the applicability of clinical positive psychology, focusing especially on Hungarian clinical practice. Second, we discuss the problems with the conceptualization of mental health in positive psychological framework. Third, we propose a model, the Maintainable Positive Mental Health Theory based on capacities and competences. Finally, we conclude with methodological questions and present a research protocol. The key finding of our review is that the opportunity exists for psychiatrists and psychologists to embrace disability as part of human experiences and to show how people with vulnerabilities can be supported to recover. (Neuropsychopharmacol Hung 2022; 24(3): 113-119).