Rapid formation and development of new theories of systems science have become an important part of modern science and technology.
For - ample, since the 1940s, there have appeared systems theory, information theory, fuzzy mathematics, cybernetics, dissipative
structures, synergetics, catastrophe theory, chaos theory, bifurcations, ultra circulations, dynamics, and many other systems
theories. Grey systems theory is also one of such systems theories that appeared initially in the 1980s. When the research
of systems science and the method and technology of systems engineering are applied in various traditional disciplines, such
as management science, decision science, and various scienti?c disciplines, a whole new group of new results and breakthroughs
are obtained. Such a historical background has provided the environment and soil for grey systems theory to form and to develop
rapidly in the past 20-plus years. More speci?cally, in 1982, Professor Deng Ju-Long published the ?rst research paper in
the area of grey systems in the international journal entitled Systems and Control Letters, published by North-Holland Co.
His paper was titled "Control Problems of Grey Systems. " The publication of this paper signalled the birth of grey systems
theory after many years of e ective research of the founding father. This new theory soon caught the attention of the international
academic community and practitioners of science. Many well-known scholars, such as Chinese academicians Qian Xueshen, Song
Jian, and Zhang Zhongjun. Professor Roger W.