Four-point scale: this is divided i

Four-point scale: this is divided into four sectors of 25 points each, totaling 100. This model may be useful in explaining relatively precise and complicated information to stakeholders, as the scales are divided into relatively detailed sections among the four models:

sustainable (excellent): 76–100%;
potentially sustainable (good): 51–75%;
potentially unsustainable (poor): 26–50%; and
unsustainable (bad): 1–25%.