An overview of the classification of ecological normalization methods is presented to facilitate the evaluation
of alternatives. An historical review is given of the development of several ecological normalization methods such as Life
Cycle Assessment and the International Organization for Standardization's Eco-Management and Audit Scheme and the
like in the former Union of Soviet Socialist Republics (USSR), in the European mainland and in the United States of
America. Mathematical models together with medical laboratory experiments were generally used in the former USSR
to establish pollution permission levels, whereas environmental management tools are more emphasized in the Western
world as ecological normalization methods for firms. Perspectives on the future development of these methods are given.
It is concluded that the application of methods for ecological normalization is one of the most efficient ways of managing
environmental matters today and this promotes human health protection. It is also concluded that the movement towards
an increasing accord in quality standards among various countries using a complex approach will result in the continuous
development of ecological normalization methods.