Jump to navigation Jump how Much Of The Turnover Is Invested In Development search For the use in computer science, see Computational complexity. This article may need to be rewritten entirely to comply with Wikipedia’s quality standards. The discussion page may contain suggestions. Complexity characterises the behaviour of a system or model whose components interact in multiple ways and follow local rules, meaning there is no reasonable higher instruction to define the various possible interactions. The term is generally used to characterize something with many parts where those parts interact with each other in multiple ways, culminating in a higher order of emergence greater than the sum of its parts. The study of these complex linkages at various scales is the main goal of complex systems theory.
Many definitions tend to postulate or assume that complexity expresses a condition of numerous elements in a system and numerous forms of relationships among the elements. Warren Weaver posited in 1948 two forms of complexity: disorganized complexity, and organized complexity. Some definitions relate to the algorithmic basis for the expression of a complex phenomenon or model or mathematical expression, as later set out herein. Weaver perceived and addressed this problem, in at least a preliminary way, in drawing a distinction between “disorganized complexity” and “organized complexity”.
In Weaver’s view, disorganized complexity results from the particular system having a very large number of parts, say millions of parts, or many more. Though the interactions of the parts in a “disorganized complexity” situation can be seen as largely random, the properties of the system as a whole can be understood by using probability and statistical methods. A prime example of disorganized complexity is a gas in a container, with the gas molecules as the parts. Organized complexity, in Weaver’s view, resides in nothing else than the non-random, or correlated, interaction between the parts. These correlated relationships create a differentiated structure that can, as a system, interact with other systems.
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The coordinated system manifests properties not carried or dictated by individual parts. The organized aspect of this form of complexity vis-a-vis to other systems than the subject system can be said to “emerge,” without any “guiding hand”. The number of parts does not have to be very large for a particular system to have emergent properties. There are generally rules which can be invoked to explain the origin of complexity in a given system. The source of disorganized complexity is the large number of parts in the system of interest, and the lack of correlation between elements in the system.
In the case of self-organizing living systems, usefully organized complexity comes from beneficially mutated organisms being selected to survive by their environment for their differential reproductive ability or at least success over inanimate matter or less organized complex organisms. Complexity of an object or system is a relative property. Turing machines are used than when Turing machines with one tape are used. In computational complexity theory, the amounts of resources required for the execution of algorithms is studied. Such a collection of properties is often referred to as a state.
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In physical systems, complexity is a measure of the probability of the state vector of the system. Rhodes complexity is an important topic in the study of finite semigroups and automata. In software engineering, programming complexity is a measure of the interactions of the various elements of the software. This differs from the computational complexity described above in that it is a measure of the design of the software. Features comprise here all distinctive arrangements of 0’s and 1’s. The system is highly sensitive to initial conditions.
Complexity has always been a part of our environment, and therefore many scientific fields have dealt with complex systems and phenomena. The use of the term complex is often confused with the term complicated. In today’s systems, this is the difference between myriad connecting “stovepipes” and effective “integrated” solutions. This means that complex is the opposite of independent, while complicated is the opposite of simple. The behavior of a complex system is often said to be due to emergence and self-organization.
Chaos theory has investigated the sensitivity of systems to variations in initial conditions as one cause of complex behaviour. Recent developments around artificial life, evolutionary computation and genetic algorithms have led to an increasing emphasis on complexity and complex adaptive systems. In social science, the study on the emergence of macro-properties from the micro-properties, also known as macro-micro view in sociology. The topic is commonly recognized as social complexity that is often related to the use of computer simulation in social science, i. In information theory, algorithmic information theory is concerned with the complexity of strings of data. Complex strings are harder to compress. These algorithmic measures of complexity tend to assign high values to random noise.