1 definition found From The Free On-line Dictionary of Computing (27 SEP 03) [foldoc]: three-tierA {client-server} architecture in which the {user interface}, functional process logic ("business rules") and data storage and access are developed and maintained as independent {modules}, most often on separate {platforms}. Apart from the usual advantages of modular software with well defined interfaces, the three-tier architecture is intended to allow any of the three tiers to be upgraded or replaced independently as requirements or technology change. For example, an upgrade of desktop {operating system} from {Microsoft Windows} to {Unix} would only affect the {user interface} code. Typically, the user interface runs on a desktop {PC} or {workstation} and uses a standard {graphical user interface}, functional process logic may consist of one or more separate modules running on a {workstation} or application {server}, and an {RDBMS} on a database server or {mainframe} contains the data storage logic. The middle tier may be multi-tiered itself (in which case the overall architecture is called an "n-tier architecture"). (1998-05-13)
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