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multi-layer comparison table

Subject	use	allow	increases	facilitate	has definition	reduce	is a synonym of	is a kind of	anticipate
architectural pattern		you to design flexible systems using components that are as independent of each other as possible			A pattern used in software architecture		architectural style	pattern
multi-layer	to build a multi-layer system	replacement of a layer by an improved version, or by one with a different set of capabilities	reusability because the lower layers can often be designed generically so that they can be used to provide the same services for different systems	divide and conquer since the separate layers can be independently designed	An architectural pattern in which a system is divided into layers	coupling since well-designed lower layers do not know about the higher layers		architectural pattern	obsolescence: databases and UI systems tend to change; by isolating these in separate layers, the system becomes more resistant to obsolescence

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