Sustainability is of three kinds:
- Sustainability of Process
In non-living process-based systems, sustainability means
“maintaining the process” and “ensuring
performance to specifications” across time and circumstances
(eg.: process plants or urban systems).
In living, trans-human systems, sustainability means maintaining
the systemic or ecological balance across all the constituents
- Sustainability of Evolution
In living, human systems, sustainability means maintaining
the capacity of the system and its individuals to survive
challenges, grow in the face of adversity, and evolve in
its own capacity to serve their “reason for being”.