Integrative level
Encyclopedia
An integrative level, or level of organization, is a set of phenomena emerging
Emergence
In philosophy, systems theory, science, and art, emergence is the way complex systems and patterns arise out of a multiplicity of relatively simple interactions. Emergence is central to the theories of integrative levels and of complex systems....

 on pre-existing phenomena of lower level. Typical examples include life
Life
Life is a characteristic that distinguishes objects that have signaling and self-sustaining processes from those that do not, either because such functions have ceased , or else because they lack such functions and are classified as inanimate...

 emerging on non-living substances, and consciousness
Consciousness
Consciousness is a term that refers to the relationship between the mind and the world with which it interacts. It has been defined as: subjectivity, awareness, the ability to experience or to feel, wakefulness, having a sense of selfhood, and the executive control system of the mind...

 emerging on nervous system
Nervous system
The nervous system is an organ system containing a network of specialized cells called neurons that coordinate the actions of an animal and transmit signals between different parts of its body. In most animals the nervous system consists of two parts, central and peripheral. The central nervous...

s.

The main levels usually acknowledged are those of matter, life, mind, and society. These are called strata in Nicolai Hartmann
Nicolai Hartmann
-Biography:Hartmann was born of German descent in Riga, which was then the capital of the Russian province of Livonia, and which is now in Latvia. He studied Medicine at the University of Tartu , then Philosophy in St. Petersburg and at the University of Marburg in Germany, where he took his Ph.D....

's ontology. They can be further analyzed into more specific layers, such as those of particles, atoms, molecules, and rocks forming the material stratum, or those of cells, organisms, populations, and ecosystems forming the life stratum.

The sequence of levels is often described as one of increasing complexity
Complexity
In general usage, complexity tends to be used to characterize something with many parts in intricate arrangement. The study of these complex linkages is the main goal of complex systems theory. In science there are at this time a number of approaches to characterizing complexity, many of which are...

, although it is not clear whether this is always true: for example, parasitism
Parasitism
Parasitism is a type of symbiotic relationship between organisms of different species where one organism, the parasite, benefits at the expense of the other, the host. Traditionally parasite referred to organisms with lifestages that needed more than one host . These are now called macroparasites...

 emerges on pre-existing organisms, although parasites are often simpler than their originating forms.

Integrative levels are discussed variously in the work of many philosophers, although only few have dealt with this notion in a systematic way; among them are Samuel Alexander
Samuel Alexander
Samuel Alexander OM was an Australian-born British philosopher. He was the first Jewish fellow of an Oxbridge college.-Early life:...

, Conwy Lloyd Morgan, George Conger, Joseph Needham
Joseph Needham
Noel Joseph Terence Montgomery Needham, CH, FRS, FBA , also known as Li Yuese , was a British scientist, historian and sinologist known for his scientific research and writing on the history of Chinese science. He was elected a fellow of the Royal Society in 1941, and as a fellow of the British...

, James K. Feibleman, Nicolai Hartmann
Nicolai Hartmann
-Biography:Hartmann was born of German descent in Riga, which was then the capital of the Russian province of Livonia, and which is now in Latvia. He studied Medicine at the University of Tartu , then Philosophy in St. Petersburg and at the University of Marburg in Germany, where he took his Ph.D....

, and Roberto Poli. Ideas connected to levels can be found in the works of both materialist philosophers, like Friedrich Engels
Friedrich Engels
Friedrich Engels was a German industrialist, social scientist, author, political theorist, philosopher, and father of Marxist theory, alongside Karl Marx. In 1845 he published The Condition of the Working Class in England, based on personal observations and research...

, and anti-materialist ones, like Henri Bergson
Henri Bergson
Henri-Louis Bergson was a major French philosopher, influential especially in the first half of the 20th century. Bergson convinced many thinkers that immediate experience and intuition are more significant than rationalism and science for understanding reality.He was awarded the 1927 Nobel Prize...

.

Integrative levels, or the disciplines focusing on them, form the main classes of several knowledge organization systems, including Roget's Thesaurus
Roget's Thesaurus
Roget's Thesaurus is a widely-used English language thesaurus, created by Dr. Peter Mark Roget in 1805 and released to the public on 29 April 1852. The original edition had 15,000 words, and each new edition has been larger...

, the Bliss bibliographic classification
Bliss bibliographic classification
The Bliss bibliographic classification is a library classification system that was created by Henry E. Bliss , published in four volumes between 1940 and 1953. Although originally devised in the United States, it was more commonly adopted by British libraries than by American ones...

, the Colon classification
Colon classification
Colon classification is a system of library classification developed by S. R. Ranganathan. It was the first ever faceted classification. The first edition was published in 1933. Since then six more editions have been published...

, and the Information coding classification. Their use as the basis of a general classification of phenomena has been especially studied by Douglas Foskett for the Classification Research Group, and by the Integrative Levels Classification project.
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