Five-point scale: this is divided into five sectors of 20 points each, totaling 100. This model may be useful in explaining the very precise and complicated information
to stakeholders,as the scales are divided into the most detailed sections among the four models below:
sustainable (excellent): 81–100%;
potentially sustainable (good): 61–80%;
intermediate (medium): 41–60%;
potentially unsustainable (poor): 21–40%; and
unsustainable (bad): 1–20%.