The Natural Step (TNS)Framework it is a comprehensive model for planning in complex systems. It is openly published and free for all to use. The TNS Framework is based on systems thinking; recognizing that what
happens in one part of a system affects every other part. This scientifically rigorous Framework gives organisations the tools to perform a gap analysis using the lens of sustainability, and then work toward closing the gap. Furthermore, The Natural Step Framework complements other sustainability tools and methodologies, such as life cycle analysis or environmental management systems, by providing the
context and strategic vision that makes them more effective.