In contrast, other research programs, such as Critical Zone[4] science, aim to develop a more quantitative theoretic framework focusing on the development of analytical and numerical models, by building on theoretical advances in complex adaptive systems, complexity economics, dynamical systems theory, and the earth sciences.
To some extent, all CHANS programs recognize the need to move beyond traditional research methods developed in the social and natural sciences, as these are not sufficient to quantify the highly nonlinear dynamics often present in CHANS.
[7][8] "In 2007 a formal standing program in Dynamics of Coupled Natural and Human Systems was created by the U.S. National Science Foundation.
"[2]: 218 Research into CHANS is increasing in frequency in scientific literature concerning the sustainability and conservation of ecosystems and society.
[9] Funding by the National Science Foundation to study "Dynamics of Coupled Natural and Human Systems" occurred from 2001-2005 as a part of a "special competition" within the "Biocomplexity in the environment" program, and in 2007 gained formal standing.