DeCyDe-for-Sustainability on coastal wiki and the coastlearn!
A dedicated article on how to measure sustainability on coastal wiki refferes to DeCyDe-for-Sustainability as the tool for this purpose.
http://www.coastalwiki.org/coastalwiki/Measuring_sustainability
In coastlearn, DeCyDe-for-sustainability is presented as an example of a tool for measuring sustainability
http://www.coastlearn.org/tourism/tools_si.html