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Three-tier system
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'''Three-tier system''' may refer to: * [[Multitier architecture]], a client–server architecture in software engineering, typically of three tiers * [[Three-tier system (alcohol distribution)]], the system established in the U.S. after the repeal of Prohibition * [[Three-tier education]], structures of schooling in England * [[First COVID-19 tier regulations in England]], 14 October – 5 November 2020 * [[Second COVID-19 tier regulations in England]], 2 December 2020 – 29 March 2021, on 20 December it became four-tier
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