
"Sustainable development is development that meets the needs of the present without compromising the ability of future generations to meet their own needs."
Several different methods for measurement of sustainable development have been proposed. It is difficult to measure sustainable development, as it is not defined in detail what is meant by sustainable development. Besides, the concept of sustainable development will evolve with time.
For more information please have a look at:
http://iisd1.iisd.ca/
(general information)
http://www.unep.ch/earthw/indicat.htm
(indicators)