Complexity Theory Definition
Complexity theory is an interdisciplinary framework that emerged in the latter half of the twentieth century, synthesising insights from various fields, particularly the natural sciences, and applying them to understand social relations and complex systems. It is characterised by its focus on how order, adaptation, and feedback arise from the interactions between the numerous elements within these systems.
Origins and Foundations
Complexity theory gained prominence through connections with interdisciplinary research institutes, such as the Santa Fe Institute, established in 1984, which brought together physicists, mathematicians, computer programmers, and systems analysts. Key intellectual associations include world-systems sociologist Immanuel Wallerstein and Nobel laureate Ilya Prigogine, whose work influenced influential reports on the restructuring of the social sciences.
Core Principles: Emergence and Non-linearity
A fundamental concept in complexity theory is emergence, which posits that the properties, powers, and effects exhibited by a system or entity resulting from the combination of its parts can be greater than or fundamentally different from the individual components themselves. This concept highlights the relational nature of systems. For example, the flavour of sugar is an emergent property arising from the interaction of carbon, hydrogen, and oxygen atoms, rather than a property inherent in those individual elements. Furthermore, complexity theory embraces non-linearity, meaning that cause and effect do not follow simple linear relationships; small changes in initial conditions can lead to disproportionately large, unpredictable outcomes.
Relationship with Chaos Theory
While complexity theory shares an interest in non-linear laws with chaos theory—which focuses on the disruption of order through amplified sensitivity to initial conditions (such as the butterfly effect)—complexity theory is ultimately more concerned with the combination of order and disorder generated by these emergent interactions across space and time within open, interdependent networks. It seeks to describe the dynamic interplay between stable patterns and chaotic fluctuations.
Application to Social Systems
The theory is applied to conceptualise institutionalised social processes, ranging from households to vast international organisations, viewing them as pockets of relative order existing within a broader patterning of disorder. These systems are constantly changing, as repeated local actions generate unpredictable outcomes. Consequently, the effects of any localized action within this context are highly contingent, meaning they can range from microscopic to global. Complexity theory employs various metaphors, including attractors, fractals, and self-organisation, to theorise this state of ‘order on the edge of chaos’ and the guidance that arises from these intricate relationships.

