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| High and low level ： ウィキペディア英語版 |
High- and low-level
High-level and low-level are terms used in classifying levels of description and goals in many fields where systems could be described from different perspectives.
A high-level description is one that is more abstracted, describes overall goals and systemic features, and is typically more concerned with the system as a whole, or larger components of it.
A low-level description is one that describes individual components, provides detail rather than overview, rudimentary functions rather than complex overall ones, and is typically more concerned with individual components within the system and how they operate.
==Differences and similarities==
Due to the nature of complex systems, the high-level description will often be completely different from the low level one. For example, there are features to an ant colony that are not features of any individual ant; features of the human mind that are not known to be descriptive of individual neurons in the brain, features of oceans which are not features of any individual water molecule, and features to a human personality that are not features of any cell in a body. The descriptions of these differ depending at what level they are studied. Features which emerge only at a high level of description are known as epiphenomena.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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