Pressure classification methodology?

[John McManus]

 Both the global and Southeast Asian Reefs at Risk studies (and the current
one for the Caribbean) involved categorizing reefs based on potential
pressures, to the best we could determine without the expense of visiting
each reef (http://www.wri.org/wri/reefsatrisk/}. There is a classification
scheme for levels of overfishing, particularly on reefs, based on market
surveys in: