Both the "Theory of Universal Integralism" and "The General System Theory" were regarded as meta-theories because they were both drawn from other theories. Consider the theory of Universal Integralism, for instance. As mentioned above, Wilber's contributions were derived from various books and articles. He combined the best of empirical science and rational philosophy, visionary religion, and mysticism. He even integrated the three cultures of science, morality, and art. Wilber conferred great severity on evolution, as we all know, was a theory that was originally formulated by Charles Darwin.

With regard to the General System Theory, the subject matter focused on the formulation and derivation of various models, principles, and laws to generalized system....

This is because the General System Theory is consist of complex systems from the phenomena of the physical universe and life; the organized group of people characterized by common interests but distinctive culture and institutions; and to the broadest sense, the systematic body of knowledge and practice. What Bertalanffy had opened up is a broader and more significant than a single theory, for he created a new standard for the development of theories.
Bibliography

Sexology. (n.d.). Wikipedia, the free encyclopedia. Retrieved 17 April 2008, from Website: http://en.wikipedia.org/wiki/Sexology.Lastmodified 14 April 2008.

Von Bertalanffy, Ludwig. "General System Theory - a Critical Review," General Systems,

Vol. 7 (1962): pp.1-20.