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In my previous blog-entry I talked a little about how self-organization is a key aspect of software agility. In this blog-entry I'd like to explore in more detail just what "self-organization" really means. Self-organization comes from complexity science and the theory of complex adaptive systems (CAS). A system is "self-organizing" if, left to its own devices, it tends to become more organized over time. This is in stark contrast to the concept of entropy from the laws of thermodynamics whereby a closed system tends to move to a state of increasing disorder in the absence of outside influences. In a complex adaptive system where self-organization occurs, we necessarily have an open system rather than a closed one. The theory goes that if a complex system possesses the necessary emergent properties in an appropriate fitness landscape, then the system will yield emergent behavior, exhibiting system-wide "patterns", that increases the "order" or organization in the system. Hence the system has become self-organizing as a result of this emergent behavior & structure. Some of the emergent properties of self-organizing systems can include:
“There's no hierarchy of command and control in a complex adaptive system. There's no planning or managing, but there's a constant re-organizing to find the best fit to the environment. The system is continually self-organizing through the process of emergence and feedback” The Emergent Phenomena Research Group at Brywn Mawr says: "In self-organizing systems, global order (i.e., complex aggregate structure/behavior) results (emerges) from the local behaviors of simple agents following simple rules specifying conditions under which those agents act (interact) in such a way that the results of the agents' actions are fed back as input to the operation of the rule system at some future time step. " In The Science of Self-organization and Adaptivity, Francis Heylighen writes: Self-organization is basically the spontaneous creation of a globally coherent pattern out of the local interactions between initially independent components. This collective order is organized in function of its own maintenance, and thus tends to resist perturbations. This robustness is achieved by distributed, redundant control so that damage can be restored by the remaining, undamaged sections. ... From Software Development is Complex Adaptive System. No Doubt Emergence is the way complex systems and patterns arise out of a multiplicity of relatively simple interactions. Small actions of agents lead to unexpected emergent system behavior and it is impossible to predict system behavior based on the behavior of an individual agent. Small errors pile up and may cause huge problem. And last but not least, from Conditions for Self-Organizing in Human Systems : Self-organization is the spontaneous generation of order in a complex adaptive system. It is the process by which the internal dynamics of a system generate system-wide patterns. Some of the emergent patterns in a self-organizing system are coherent, and others are not. Coherence is a state of the system in which: Also see the following:
Posted: 2009-06-14 00:17:00Author:Brad Appleton
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