The scales of a system’s behavior determine what it can do. By comparing these scales to the tasks for which the system is designed, we can see whether or not it can achieve its goals and why. Multiscale Analysis proves useful in the study of large organizations, such as healthcare, the military, and corporations.


Complex Systems Modeling

NECSI uses conceptual and mathematical models to characterize the multiscale complexity of mathematical, physical and social systems, and solve a mystery of complex systems: strong emergence.

Yaneer Bar-Yam, Exercising in the space of possibilities, NECSI (August 23, 2018).

Yaneer Bar-Yam, Logic and generalization, NECSI (July 9, 2018).

Yaneer Bar-Yam, Fixing science using a new science of science, Science Trends (March 28, 2018).

Yaneer Bar-Yam, Risk and opportunity in the space of possibilities, NECSI (March 28, 2018).

Benjamin Allen, Blake C. Stacey, Yaneer Bar-Yam, Multiscale information theory and the marginal utility of information, Entropy 19(6): 273 (June 13, 2017).

Yaneer Bar-Yam, From big data to important informationComplexity 21(S2): 73-98 (April 25, 2016).

Benjamin Allen, Blake C. Stacey, and Yaneer Bar-Yam, An information-theoretic formalism for multiscale structure in complex systems, arXiv:1409.4708 (September 16, 2014).

Yaneer Bar-Yam, The limits of phenomenology: From behaviorism to drug testing and engineering, Complexity 21(S1): 181-189 (2015).

Yavni Bar-Yam, Dion Harmon, and Yaneer Bar-Yam, Computationally tractable pairwise complexity profileComplexity 18(5): 20-27 (May, 2013).

Richard Metzler, Yaneer Bar-Yam, and Mehran Kardar, Information flow through a chaotic channel: prediction and postdiction at finite resolution, Physical Review E 70: 026205 (2004).

Yaneer Bar-Yam, A mathematical theory of strong emergence using multiscale variety, Complexity 9(6): 15-24 (2004).

Yaneer Bar-Yam, Multiscale variety in complex systems, Complexity 9(4): 37-45 (2004).

Yaneer Bar-Yam, Multiscale representation phase I, Report to Chief of Naval Operations Strategic Studies Group (2001).

Moshe Ben-Ezra, Michael Werman, and Yaneer Bar-Yam, A self-stabilizing, robust region finder applied to color and optical flow pictures, Image and Vision Computing 19(7): 427-433 (May, 2001).

Raissa M. D'Souza, Yaneer Bar-Yam, and Mehran Kardar, Sensitivity of ballistic deposition to pseudorandom number generators, Physical Review E 57(5): 5044-5052 (1998).



NECSI identifies the inherent limitations of traditional engineering for highly complex challenges, and shows the potential of an evolutionary approach.

Yaneer Bar-Yam, About engineering complex systems: Multiscale analysis and evolutionary engineering, in Engineering Self-Organising Systems: Methodologies and Applications, S. Brueckner, G. Di Marzo Serugendo, A. Karageorgos, R. Nagpal, Eds. (Springer-Verlag, 2005), pp. 16-31.

Yaneer Bar-Yam, Large-scale engineering and evolutionary change, useful concepts for implementation of FORCEnet, Report to Chief of Naval Operations Strategic Studies Group (2002).


Generalizing our understanding of information to include scale provides an important tool for characterizing any system.

Gavin E. Crooks, Yaneer Bar-Yam, Sergey V. Buldyrev, and H. Eugene Stanley, Comparison of the roughness scaling of the surface topography of Earth and Venus, arXiv:1809.02457 (September 7, 2018).

Yaneer Bar-Yam and Subodh P. Patil, Renormalization of sparse disorder in the Ising model, arXiv:1805.12556 (May 31, 2018).

Richard Metzler and Yaneer Bar-Yam, Multiscale complexity of correlated Gaussians, Physical Review E 71: 046114 (2005).

Yaneer Bar-Yam, Multiscale complexity/entropy, Advances in Complex Systems 7: 47-63 (2004).

S. Gheorghiu-Svirschevski and Yaneer Bar-Yam, Multiscale analysis of information correlations in an infinite-range, ferromagnetic Ising system, Physical Review E 70: 066115 (2004).

Yaneer Bar-Yam, Sum rule for multiscale representations of kinematic systems, Advances in Complex Systems 5: 409-431 (2002).


Social Systems

Models of human social interaction developed by NECSI provide insight on the future of human civilization as well as achieving individual well-being.

Yaneer Bar-Yam and David Kantor, A mathematical theory of interpersonal interactions and group behavior, NECSI Report 2018-12-02 (December 30, 2018).

Taeer Bar-Yam, Owen Lynch, and Yaneer Bar-Yam, The inherent instability of disordered systems, arXiv:1812.00450 (December 2, 2018).

Yaneer Bar-Yam and Alice Davidson, Environmental complexity: Information for human-environment well-being, in Unifying Themes in Complex Systems (Springer, 2006), pp. 157-168.

Yaneer Bar-Yam, Complexity rising: From human beings to human civilization, a complexity profile, in Encyclopedia of Life Support Systems (EOLSS), developed under the Auspices of the UNESCO (EOLSS Publishers, Oxford, UK, 2002).

Alice Davidson, Martin H. Teicher, Yaneer Bar-Yam, The role of environmental complexity in the well being of the elderly, Complexity and Chaos in Nursing 3: 5-12 (1997).