Constitutional asymmetry is closely linked to the multinational multi-tiered systems. One of the concerns linked to this is that constitutional asymmetry affects legitimacy and stabilty in these systems. Hence, the purpose of this paper is to conceptualize legitimacy and stability under this specific frame of reference and to answer whether constitutional asymmetry indeed aftects two concepts. In the first place, this paper builds the dynamic concepts of legitimacy and stability to better fit the multinational multi-tiered systems with asymmetrical features. In the second place, the paper uses the indicators of constitutional asymmetry against the main features of legitimacy and stability in these systems. Along the way the paper compares potential drawbacks in legitimacy and stability between asymmetrical multinational multi-tiered systems and multi-tiered systems that do not display asymmetrical features.