Common to all systems, boundaries are essential in their structure, dynamic organisation, regulation and adaptation through four essential functions: relationship, multiple loops of interactions and feedback, translation, regulation and differentiation. These boundaries allow for smooth transitions that influence and have multiple implications on the nature and extent of their effects between order and disorder, or even chaos, which cannot be described purely analytically. One of the aims of this work was to analyse more specifically the decisive progress made in the better understanding of the thermodynamical “universal” natural laws nature and in particular the unavoidable implications of their intrinsically dissipative nature on the “raison d’être” of any complex system, from the physico-chemical and biological levels to the socio-cultural and political-economic levels. (Re)defining on this basis the concepts of system and their borders including its essential systemic dimension which really integrates this dissipative dimension is indeed required as this provides the clarity needed to better understand and manage the practices of our irreducibly complex societal communities. In particular the roles and effects of the various types and functions of boundaries in their dynamic “circular” cross-border relationships and in the effectiveness of the control and resilience of their fragile balances including in particular their better governance in real time. This opening ways to more clearly define within such human societal organisations the dynamics of their borders and to be able to better manage their sustainable behaviours through limits in their dissipative ecological, social and politico-economical practices.